Control and power supply systems for magnetron devices

Claim 2

An ultra-high frequency generator comprising a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a converter including a pair of input terminals and a pair of output terminals, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitudes of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, and connections between the output terminals of said converter and the input terminals of said magnetron.

Claim 3

An ultra-high frequency generator comprising a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a converter including a pair of input terminals and a pair of output terminals, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said circuit, connections between the output terminals of said converter and the input terminals of said magnetron, a low frequency a.c. supply source, and means for selectively connecting said supply source to the input terminals of said converter.

Claim 4

An ultra-high frequency generator comprising a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a converter including a pair of input terminals and a pair of output terminals, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said circuit, connections between the output terminals of said converter and the input terminals of said magnetron, a low frequency a.c. supply source, and means for selectively connecting said supply source to the input terminals of said converter.

Claim 5

An ultra-high frequency generator comprising a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a converter including a pair of input terminals and a pair of output terminals, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, connections between the output terminals of said converter and the input terminals of said magnetron, a 3-wire Edison low frequency a.c. supply source including a pair of ungrounded line conductors provided with a corresponding pair of line terminals and a grounded neuTral conductor provided with a corresponding neutral terminal, and switching apparatus having a first position connecting the line terminals of said supply source to the input terminals of said converter and a second position connecting one of the line terminals and the neutral terminal of said supply source to the input terminals of said converter.

Claim 6

An ultra-high frequency generator comprising a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a converter including a pair of input terminals and a pair of output terminals, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, connections between the output terminals of said converter and the input terminals of said magnetron, a 3-wire Edison low frequency a.c. supply source including a pair of ungrounded line conductors provided with a corresponding pair of line terminals and a grounded neuTral conductor provided with a corresponding neutral terminal, and switching apparatus having a first position connecting the line terminals of said supply source to the input terminals of said converter and a second position connecting one of the line terminals and the neutral terminal of said supply source to the input terminals of said converter.

Claim 7

The ultra-high frequency generator set forth in claim 3, wherein the line-to-line R.M.S. voltage of said supply source is in the general range 220 to 250 volts and the line-to-neutral R.M.S. voltage of said supply source is in the general range 110 to 125 volts.

Claim 8

Electronic heating apparatus comprising metal wall structure defining a heating cavity, an antenna electrically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a first connection between one of the output terminals of said magnetron and said antenna, a second connection between the other of the output terminals of said magnetron and said wall structure, a converter including a pair of input terminals and a pair of output terminals, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple the peak value of the a.c. input voltage to said converter, and connections between the output terminals of said converter and the input terminals of said magnetron.

Claim 9

Electronic heating apparatus comprising metal wall structure defining a heating cavity, an antenna electrically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a first connection between one of the output terminals of said magnetron and said antenna, a second connection between the other of the output terminals of said magnetron and said wall structure, a converter including a pair of input terminals and a pair of output terminals, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple the peak value of the a.c. input voltage to said converter, and connections between the output terminals of said converter and the input terminals of said magnetron.

Claim 10

Electronic heating apparatus comprising metal wall structure defining a heating cavity, an antenna electrically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a first capacitive coupling between one of the output terminals of said magnetron and said antenna, a second capacitive coupling between the other of the output terminals of said magnetron and said wall structure, a converter including a pair of input terminals and a pair of output terminals, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application or a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, and connections between the output terminals of said converter and the input terminals of said magnetron.

Claim 11

Electronic heating apparatus comprising metal wall structure defining a heating cavity, an antenna electrically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a first capacitive coupling between one of the output terminals of said magnetron and said antenna, a second capacitive coupling between the other of the output terminals of said magnetron and said wall structure, a converter including a pair of input terminals and a pair of output terminals, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application or a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, and connections between the output terminals of said converter and the input terminals of said magnetron.

Claim 12

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwave into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input terminals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a manually-settable timer-operated program controller having stop and run positions, means governed by said program controller in its run position for operating said power switch into its closed position and governed by said program controller in its stop position for operating said power switch into its open position, a thermostatic switch operatively associated with said magnetron, and means governed by said thermostatic switch in response to an abnormally high temperature of said magnetron for operating said power switch into its open position notwithstanding the possible run position of said program controller.

Claim 13

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwave into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input terminals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a manually-settable timer-operated program controller having stop and run positions, means governed by said program controller in its run position for operating said power switch into its closed position and governed by said program controller in its stop position for operating said power switch into its open position, a thermostatic switch operatively associated with said magnetron, and means governed by said thermostatic switch in response to an abnormally high temperature of said magnetron for operating said power switch into its open position notwithstanding the possible run position of said program controller.

Claim 14

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input terminals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a manually-settable timer-operated program controller having stop and run positions, a fan operative to direct a stream of cooling fluid into heat-exchange relation with said magnetron, means governed by said program controller in its run position for operating said power switch into its closed position and for initiating operation of said fan and governed by said program controller in its stop position for operating said power switch into its open position and for arresting operation of said fan, a thermostatic switch operatively associated with said magnetron, and means governed by said thermostatic switch in response to an abnormally high temperature of said magnetron for operating said power switch into its open position notwithstanding the possible run position of said program controller.

Claim 15

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input terminals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a manually-settable timer-operated program controller having stop and run positions, a fan operative to direct a stream of cooling fluid into heat-exchange relation with said magnetron, means governed by said program controller in its run position for operating said power switch into its closed position and for initiating operation of said fan and governed by said program controller in its stop position for operating said power switch into its open position and for arresting operation of said fan, a thermostatic switch operatively associated with said magnetron, and means governed by said thermostatic switch in response to an abnormally high temperature of said magnetron for operating said power switch into its open position notwithstanding the possible run position of said program controller.

Claim 16

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input termiNals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a program controller having a stop position and a variable run position, manual means for selectively setting said program controller from its stop position into its variable run position, thereby correspondingly to preset a variable time interval into said program controller, a timer motor operative to return said program controller from its variable run position back into its stop position during a time interval corresponding to that preset therein, a time delay relay, means responsive to setting of said program controller into its run position for initiating operation of said time delay relay, whereby said time delay relay is fully operated a short time interval thereafter, means responsive to full operation of said time delay relay for initiating operation of said timer motor, means responsive to the return of said program controller back into its stop position for restoring said time delay relay and for arresting operation of said timer motor, and means governed jointly by said program controller in its run position and by said time delay relay in its fully operated position for operating said power switch into its closed position and governed either by said program controller in its stop position or by said time delay relay in other than its fully operated position for operating said power switch into its open position.

Claim 17

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input termiNals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a program controller having a stop position and a variable run position, manual means for selectively setting said program controller from its stop position into its variable run position, thereby correspondingly to preset a variable time interval into said program controller, a timer motor operative to return said program controller from its variable run position back into its stop position during a time interval corresponding to that preset therein, a time delay relay, means responsive to setting of said program controller into its run position for initiating operation of said time delay relay, whereby said time delay relay is fully operated a short time interval thereafter, means responsive to full operation of said time delay relay for initiating operation of said timer motor, means responsive to the return of said program controller back into its stop position for restoring said time delay relay and for arresting operation of said timer motor, and means governed jointly by said program controller in its run position and by said time delay relay in its fully operated position for operating said power switch into its closed position and governed either by said program controller in its stop position or by said time delay relay in other than its fully operated position for operating said power switch into its open position.

Claim 18

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input terminals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a program controller having a stop position and a variable run position, manual means for selectively setting said program controller from its stop position into its removable run position, thereby correspondingly to preset a variable time interval into said program controller, a timer motor operative to return said program controller from its variable run position back into its stop position during a time interval corresponding to that preset therein, a time delay relay, means responsive to setting of said program controller into its run position for initiating operation of said time delay relay, whereby said time delay relay is fully operated a short time interval thereafter, means responsive to full operation of said time delay relay for initiating operation of said timer motor, means responsive to the return of said program controller back into its stop position for restoring said time delay relay and for arresting operation of said timer motor, means governed jointly by said program controller in its run position and by said time delay relay in its fully operated position for operating said power switch into its closed position and governed either by said program controller in its stop position or by said time delay relay in other than its fully operated position for operating said power switch into its open position, a thermostatic switch operatively associated with said magnetron, and means governed by sAid thermostatic switch in response to an abnormally high temperature of said magnetron for restoring said time delay relay notwithstanding the possible run position of said program controller.

Claim 19

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input terminals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a program controller having a stop position and a variable run position, manual means for selectively setting said program controller from its stop position into its removable run position, thereby correspondingly to preset a variable time interval into said program controller, a timer motor operative to return said program controller from its variable run position back into its stop position during a time interval corresponding to that preset therein, a time delay relay, means responsive to setting of said program controller into its run position for initiating operation of said time delay relay, whereby said time delay relay is fully operated a short time interval thereafter, means responsive to full operation of said time delay relay for initiating operation of said timer motor, means responsive to the return of said program controller back into its stop position for restoring said time delay relay and for arresting operation of said timer motor, means governed jointly by said program controller in its run position and by said time delay relay in its fully operated position for operating said power switch into its closed position and governed either by said program controller in its stop position or by said time delay relay in other than its fully operated position for operating said power switch into its open position, a thermostatic switch operatively associated with said magnetron, and means governed by sAid thermostatic switch in response to an abnormally high temperature of said magnetron for restoring said time delay relay notwithstanding the possible run position of said program controller.

Claim 20

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input terminals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a program controller having a stop position and a variable run position, manual means for selectively setting said program controller from its stop position into its variable run position, thereby correspondingly to preset a variable time interval into said program controller, a timer motor operative to return said program controller from its variable run position back into its stop position during a time interval corresponding to that preset therein, a fan operative to direct a stream of cooling fluid into heat-exchange relation with said magnetron, a time delay relay, means responsive to setting of said program controller into its run position for initiating operation of said fan and for initiating operation of said time delay relay, whereby said time delay relay is fully operated a short time interval thereafter, means responsive to full operation of said time delay relay for initiating operation of said timer motor, means responsive to the return of said program controller back into its stop position for arresting operation of said fan and for restoring said time delay relay and for arresting operation of said timer motor, and means governed jointly by said program controller in its run position and by said time delay relay in its fully operated position for operating said power switch into its closed position and governed either by said program controller in its stop position or by said time delay relay in other than its fully operated position for operating said power switch into its open position.

Claim 21

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input terminals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a program controller having a stop position and a variable run position, manual means for selectively setting said program controller from its stop position into its variable run position, thereby correspondingly to preset a variable time interval into said program controller, a timer motor operative to return said program controller from its variable run position back into its stop position during a time interval corresponding to that preset therein, a fan operative to direct a stream of cooling fluid into heat-exchange relation with said magnetron, a time delay relay, means responsive to setting of said program controller into its run position for initiating operation of said fan and for initiating operation of said time delay relay, whereby said time delay relay is fully operated a short time interval thereafter, means responsive to full operation of said time delay relay for initiating operation of said timer motor, means responsive to the return of said program controller back into its stop position for arresting operation of said fan and for restoring said time delay relay and for arresting operation of said timer motor, and means governed jointly by said program controller in its run position and by said time delay relay in its fully operated position for operating said power switch into its closed position and governed either by said program controller in its stop position or by said time delay relay in other than its fully operated position for operating said power switch into its open position.

Claim 22

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input terminals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a program controller haviNg a stop position and a variable run position, manual means for selectively setting said program controller from its stop position into its variable run position, thereby correspondingly to preset a variable time interval into said program controller, a timer motor operative to return said program controller from its variable run position back into its stop position during a time interval corresponding to that preset therein, a fan operative to direct a stream of cooling fluid into heat-exchange relation with said magnetron, a time delay relay, means responsive to setting of said program controller into its run position for initiating operation of said fan and for initiating operation of said time delay relay, whereby said time delay relay is fully operated a short time interval thereafter, means responsive to full operation of said time delay relay for initiating operation of said timer motor, means responsive to the return of said program controller back into its stop position for arresting operation of said fan and for restoring said time delay relay and for arresting operation of said timer motor, means governed jointly by said program controller in its run position and by said time delay relay in its fully operated position for operating said power switch into its closed position and governed either by said program controller in its stop position or by said time delay relay in other than its fully operated position for operating said power switch into its open position, a thermostatic switch operatively associated with said magnetron, and means governed by said thermostatic switch in response to an abnormally high temperature of said magnetron for restoring said time delay relay notwithstanding the possible run position of said program controller.

Claim 23

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a low frequency a.c. supply source, a power switch having a closed position connecting said supply source to the input terminals of said circuit and an open position disconnecting said supply source from the input terminals of said circuit, a program controller haviNg a stop position and a variable run position, manual means for selectively setting said program controller from its stop position into its variable run position, thereby correspondingly to preset a variable time interval into said program controller, a timer motor operative to return said program controller from its variable run position back into its stop position during a time interval corresponding to that preset therein, a fan operative to direct a stream of cooling fluid into heat-exchange relation with said magnetron, a time delay relay, means responsive to setting of said program controller into its run position for initiating operation of said fan and for initiating operation of said time delay relay, whereby said time delay relay is fully operated a short time interval thereafter, means responsive to full operation of said time delay relay for initiating operation of said timer motor, means responsive to the return of said program controller back into its stop position for arresting operation of said fan and for restoring said time delay relay and for arresting operation of said timer motor, means governed jointly by said program controller in its run position and by said time delay relay in its fully operated position for operating said power switch into its closed position and governed either by said program controller in its stop position or by said time delay relay in other than its fully operated position for operating said power switch into its open position, a thermostatic switch operatively associated with said magnetron, and means governed by said thermostatic switch in response to an abnormally high temperature of said magnetron for restoring said time delay relay notwithstanding the possible run position of said program controller.

Claim 24

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, said magnetron being further characterized by an ultra-high frequency power output from the output terminals thereof that is generally proportional to the amplitude of the d.c. voltage applied across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, said circuit being further characterized by a d.c. output voltage across the output terminals thereof that is generally proportional to the amplitude of the a.c. input voltage applied across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a first low frequency a.c. supply source of relatively low voltage, a second low frequency a.c. supply source of relatively high voltage, a manually operable control switch having a first position selecting said first supply source and a second position selecting said second supply source, a power switch having a closed position connecting the selected one of said supply sources to the input terminals of said circit and an open position disconnecting the selected one of said supply sources from the input terminals of said circuit, and means for selectively operating said power switch between its open and closed positions, whereby operation of said control switch into its first position preselects a relatively low electronic heating rate for said heating cavity and operation of said control switch into its second position preselects a relative high electronic heating rate for said heating cavity.

Claim 25

Electronic heating apparatus comprising metal wall structure defining a heating cavity, a magnetron including a pair of input terminals and a pair of output terminals, said magnetron being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, said magnetron being further characterized by an ultra-high frequency power output from the output terminals thereof that is generally proportional to the amplitude of the d.c. voltage applied across the input terminals thereof, means connected to the output terminals of said magnetron for supplying microwaves into said heating cavity, a power supply circuit including a pair of input terminals and a pair of output terminals, said circuit being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, said circuit being further characterized by a d.c. output voltage across the output terminals thereof that is generally proportional to the amplitude of the a.c. input voltage applied across the input terminals thereof, connections between the output terminals of said circuit and the input terminals of said magnetron, a first low frequency a.c. supply source of relatively low voltage, a second low frequency a.c. supply source of relatively high voltage, a manually operable control switch having a first position selecting said first supply source and a second position selecting said second supply source, a power switch having a closed position connecting the selected one of said supply sources to the input terminals of said circit and an open position disconnecting the selected one of said supply sources from the input terminals of said circuit, and means for selectively operating said power switch between its open and closed positions, whereby operation of said control switch into its first position preselects a relatively low electronic heating rate for said heating cavity and operation of said control switch into its second position preselects a relative high electronic heating rate for said heating cavity.

Claim 26

The electronic heating apparatus set forth in claim 13, wherein aid first a.c. supply source has a frequency of about 60 cycles and a R.M.S. voltage in the general range 110 to 125 volts, and said second a.c. supply source has a frequency of about 60 cycles and a R.M.S. voltage in the general range 220 to 250 volts.

Claim 27

The electronic heating apparatus set forth in claim 13, wherein said first and second a.c. supply sources are derived from a single-phase 3-wire Edison supply network.

Claim 28

In an apparatus for dielectric heating, by means of micro-waves, metal means forming an oven space, a magnetron type micro-wave generator, a transmission line for micro-waves coupling said micro-wave generator to said oven space and comprising a capacitive member constituting a galvanic insulation between said oven space and said micro-wave generator; a voltage converter coupled to said micro-wave generator and to a main electric supply system, said converter comprising a galvanic connection inter-connecting said micro-wave generator and said electric supply system; a grounded, protective casing for said micro-wave generator and said voltage converter, cooling means for said micro-wave generator; and supporting means carrying said micro-wave generator and insulating it galvanically from said protective casing.

Claim 29

In an apparatus for dielectric heating, by means of micro-waves, metal means forming an oven space, a magnetron type micro-wave generator, a transmission line for micro-waves coupling said micro-wave generator to said oven space and comprising a capacitive member constituting a galvanic insulation between said oven space and said micro-wave generator; a voltage converter coupled to said micro-wave generator and to a main electric supply system, said converter comprising a galvanic connection inter-connecting said micro-wave generator and said electric supply system; a grounded, protective casing for said micro-wave generator and said voltage converter, cooling means for said micro-wave generator; and supporting means carrying said micro-wave generator and insulating it galvanically from said protective casing.

Claim 30

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the applicaton of a d.c. voltage across the input terminals thereof, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an R.M.S. voltage in the general range 220 to 250 volts therebetween, and a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals.

Claim 31

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the applicaton of a d.c. voltage across the input terminals thereof, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an R.M.S. voltage in the general range 220 to 250 volts therebetween, and a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals.

Claim 32

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an R.M.S. voltage in the general range 220 to 250 volts therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line termiNals, a protective casing disposed about and completely enclosing both said device and said converter, and insulators disposed between said protective casing and both said device and said converter and insulating both said device and said converter galvanically from said protective casing.

Claim 33

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an R.M.S. voltage in the general range 220 to 250 volts therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line termiNals, a protective casing disposed about and completely enclosing both said device and said converter, and insulators disposed between said protective casing and both said device and said converter and insulating both said device and said converter galvanically from said protective casing.

Claim 34

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a 3-wire Edison low frequency a.c. supply source including a neutral conductor and a pair of outside line conductors provided with a corresponding pair of line terminals having an R.M.S. voltage in the general range 220 to 250 volts therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, an output coaxial transmission line including an inner conductor having an outer annular conductor disposed therearound, means capacitively coupling said inner and outer conductors respectively to the output terminals of said devices and providing a galvanic insulation between said transmission line and said device, and means connecting said outer conductor to said neutral conductor.

Claim 35

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a 3-wire Edison low frequency a.c. supply source including a neutral conductor and a pair of outside line conductors provided with a corresponding pair of line terminals having an R.M.S. voltage in the general range 220 to 250 volts therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, an output coaxial transmission line including an inner conductor having an outer annular conductor disposed therearound, means capacitively coupling said inner and outer conductors respectively to the output terminals of said devices and providing a galvanic insulation between said transmission line and said device, and means connecting said outer conductor to said neutral conductor.

Claim 36

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a 3-wire Edison low frequency a.c. supply source including a grounded neutral conductor and a pair of outside line conductors provided with a corresponding pair of line terminals having an R.M.S. voltage in the general range 220 to 250 volts therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, a protective casing disposed about and completely enclosing both said device and said converter, insulators disposed between said protective casing and both said device and said converter and insulating both said device and said converter galvanically from said protective casing, an output coaxial transmission line including an inner conductor having an outer annular conductor disposed therearound, means capacitively coupling said inner and outer conductors respectively to the output terminals of said devices and providing a galvanic insulation between said transmission line and said deviCe, and means connecting both said protective casing and said outer conductor to said grounded neutral conductor.

Claim 37

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a 3-wire Edison low frequency a.c. supply source including a grounded neutral conductor and a pair of outside line conductors provided with a corresponding pair of line terminals having an R.M.S. voltage in the general range 220 to 250 volts therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, a protective casing disposed about and completely enclosing both said device and said converter, insulators disposed between said protective casing and both said device and said converter and insulating both said device and said converter galvanically from said protective casing, an output coaxial transmission line including an inner conductor having an outer annular conductor disposed therearound, means capacitively coupling said inner and outer conductors respectively to the output terminals of said devices and providing a galvanic insulation between said transmission line and said deviCe, and means connecting both said protective casing and said outer conductor to said grounded neutral conductor.

Claim 38

Electronic heating apparatus comprising metal wall structure defining a heating cavity, an antenna galvanically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the inputs terminals thereof, a coaxial transmission line including an inner conductor and an outer annular conductor disposed therearound, means including a pair of capacitive couplers interconnecting said inner conductor between one of said output terminals and said antenna and interconnecting said outer conductor between the other of said output terminals and said metal wall structure, a 3-wire Edison low frequency a.c. supply source including a grounded neutral conductor and a pair of outside line conductors provided with a corresponding pair of line terminals having an R.M.S. voltage in the general range 220 to 250 volts therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, and means connecting said metal wall structure to said grounded neutral conductor.

Claim 39

Electronic heating apparatus comprising metal wall structure defining a heating cavity, an antenna galvanically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the inputs terminals thereof, a coaxial transmission line including an inner conductor and an outer annular conductor disposed therearound, means including a pair of capacitive couplers interconnecting said inner conductor between one of said output terminals and said antenna and interconnecting said outer conductor between the other of said output terminals and said metal wall structure, a 3-wire Edison low frequency a.c. supply source including a grounded neutral conductor and a pair of outside line conductors provided with a corresponding pair of line terminals having an R.M.S. voltage in the general range 220 to 250 volts therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter consisting essentially of an assembly of capacitors and rectifiers and being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is approximately double the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, and means connecting said metal wall structure to said grounded neutral conductor.

Claim 40

The electronic heating apparatus set forth in claim 21, wherein said outer conductor is galvanically connected to said metal wall structure and is capacitively coupled to the adjacent one of said output terminals, and said means connecting said metal wall structure to said grounded neutral conductor also connects said outer conductor to said grounded neutral conductor.

Claim 41

The electronic heating apparatus set forth in claim 21, and further comprising a protective casing disposed about and completely enclosing both said device and said converter, insulators disposed between said protective casing and both said device and said converter and insulating both said device and said converter galvanically from said protective casing, and means connecting said protective casing to said grounded neutral conductor.

Claim 42

The electronic heating apparatus set forth in claim 23, and further comprising means for circulating a cooling fluid through said protective casing and over said device for effecting cooling of said device.

Claim 43

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, and a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. inPut voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals.

Claim 44

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, and a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. inPut voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals.

Claim 45

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of an input voltage across the input terminals thereof, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, means interconnecting the input terminals of said device and said line terminals and providing galvanic connections between the input terminals of said device and at least one of said line terminals, an output coaxial transmission line including an inner conductor having an outer annular conductor disposed therearound, means capacitively coupling said inner and outer conductors respectively to the output terminals of said device and providing a galvanic insulation between said transmission line and said device, and means connecting said outer conductor to ground potential.

Claim 46

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of an input voltage across the input terminals thereof, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, means interconnecting the input terminals of said device and said line terminals and providing galvanic connections between the input terminals of said device and at least one of said line terminals, an output coaxial transmission line including an inner conductor having an outer annular conductor disposed therearound, means capacitively coupling said inner and outer conductors respectively to the output terminals of said device and providing a galvanic insulation between said transmission line and said device, and means connecting said outer conductor to ground potential.

Claim 47

Electronic heating apparatus comprising wall structure defining a heating cavity, and an antenna galvanically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a crossed-field discharge device including a pair of input terminals and a pair of output terminals, sai device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of an input voltage across the input terminals thereof, means capacitively coupling one of said output terminals to said antenna, means capacitively coupling the other of said output terminals to said metal wall structure, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, means interconnecting the input terminals of said device and said line terminals and providing galvanic connections between the input terminals of said device and at least one of said line terminals, and means connecting said metal wall structure to ground potential.

Claim 48

Electronic heating apparatus comprising wall structure defining a heating cavity, and an antenna galvanically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a crossed-field discharge device including a pair of input terminals and a pair of output terminals, sai device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of an input voltage across the input terminals thereof, means capacitively coupling one of said output terminals to said antenna, means capacitively coupling the other of said output terminals to said metal wall structure, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, means interconnecting the input terminals of said device and said line terminals and providing galvanic connections between the input terminals of said device and at least one of said line terminals, and means connecting said metal wall structure to ground potential.

Claim 49

Electronic heating apparatus comprising wall structure defining a heating cavity, and an antenna galvanically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of an input voltage across the input terminals thereof, means capacitively coupling one of said output terminals to said antenna, means capacitively coupling the other of said output terminals to said metal wall structure, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said voltage from said converter is a multiple of the peak value of the a.c. input voltage to said a.c. converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, and means connecting said metal wall structure to ground potential.

Claim 50

Electronic heating apparatus comprising wall structure defining a heating cavity, and an antenna galvanically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of an input voltage across the input terminals thereof, means capacitively coupling one of said output terminals to said antenna, means capacitively coupling the other of said output terminals to said metal wall structure, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said voltage from said converter is a multiple of the peak value of the a.c. input voltage to said a.c. converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, and means connecting said metal wall structure to ground potential.

Claim 51

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, a protective casing disposed about and completely enclosing both said device and said converter, and insulators disposed between said protective casing and said device and said converter and galvanically insulating said device and said converter from said protective casing.

Claim 52

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, a protective casing disposed about and completely enclosing both said device and said converter, and insulators disposed between said protective casing and said device and said converter and galvanically insulating said device and said converter from said protective casing.

Claim 53

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a protective casing disposed about and completely enclosing said device, insulators disposed between said protective casing and said device and galvanically insulating said device from said protective casing, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, and a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals.

Claim 54

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a protective casing disposed about and completely enclosing said device, insulators disposed between said protective casing and said device and galvanically insulating said device from said protective casing, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, and a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals.

Claim 55

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a first protective casing disposed about and completely enclosing said device, insulators disposed between said first protective casing and said device galvanically insulating said device from said first protective casing, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, and a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output Terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, a second protective casing disposed about and completely enclosing said first protective casing and said converter, insulators disposed between said second protective casing and said converter and insulating said converter galvanically from said second protective casing, and means galvanically interconnecting said first protective casing to said second protective casing and to ground potential.

Claim 56

An ultra-high frequency generator comprising a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of a d.c. voltage across the input terminals thereof, a first protective casing disposed about and completely enclosing said device, insulators disposed between said first protective casing and said device galvanically insulating said device from said first protective casing, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, and a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output Terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said converter is a multiple of the peak value of the a.c. input voltage to said converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, a second protective casing disposed about and completely enclosing said first protective casing and said converter, insulators disposed between said second protective casing and said converter and insulating said converter galvanically from said second protective casing, and means galvanically interconnecting said first protective casing to said second protective casing and to ground potential.

Claim 57

Electronic heating apparatus comprising wall structure defining a heating cavity, and an antenna galvanically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of an input voltage across the input terminals thereof, means capacitively coupling one of said output terminals to said antenna, means capacitively coupling the other of said output terminals to said metal wall structure, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said voltage from said converter is a multiple of the peak value of the a.c. input voltage to said a.c. converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, and a protective casing disposed about and completely enclosing said device and said converter and said metal wall structure, insulators disposed between said protective casing and said device and said converter and insulating said device and said converter galvanically from said protective casing, and means connecting said protective casing to ground potential.

Claim 58

Electronic heating apparatus comprising wall structure defining a heating cavity, and an antenna galvanically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of an input voltage across the input terminals thereof, means capacitively coupling one of said output terminals to said antenna, means capacitively coupling the other of said output terminals to said metal wall structure, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. output voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said voltage from said converter is a multiple of the peak value of the a.c. input voltage to said a.c. converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, and a protective casing disposed about and completely enclosing said device and said converter and said metal wall structure, insulators disposed between said protective casing and said device and said converter and insulating said device and said converter galvanically from said protective casing, and means connecting said protective casing to ground potential.

Claim 59

Electronic heating apparatus comprising wall structure defining a heating cavity, and an antenna galvanically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of an input voltage across the input terminals thereof, means capacitively coupling one of said output terminals to said antenna, means capacitively coupling the other of said output terminals to said metal wall structure, a first protective casing disposed about and completely enclosing said device, insulators disposed between said first protective casing and said device and galvanically insulating said device from said first protective casing, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. outpUt voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said voltage from said converter is a multiple of the peak value of the a.c. input voltage to said a.c. converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, a second protective casing disposed about and completely enclosing said first protective casing and said device and said metal wall structure, insulators disposed between said second protective casing and said converter and insulating said converter galvanically from said second protective casing, and means galvanically interconnecting said first protective casing to said second protective casing and to ground potential.

Claim 60

Electronic heating apparatus comprising wall structure defining a heating cavity, and an antenna galvanically insulated from said wall structure and arranged to radiate microwaves into said heating cavity, a crossed-field discharge device including a pair of input terminals and a pair of output terminals, said device being characterized by the production of an a.c. voltage of ultra-high frequency across the output terminals thereof in response to the application of an input voltage across the input terminals thereof, means capacitively coupling one of said output terminals to said antenna, means capacitively coupling the other of said output terminals to said metal wall structure, a first protective casing disposed about and completely enclosing said device, insulators disposed between said first protective casing and said device and galvanically insulating said device from said first protective casing, a low frequency a.c. supply source including a pair of line conductors provided with a corresponding pair of line terminals having an a.c. voltage therebetween, a converter including a pair of input terminals respectively connected to said line terminals and a pair of output terminals respectively connected to the input terminals of said device, said converter being characterized by the production of a d.c. outpUt voltage across the output terminals thereof in response to the application of a low frequency a.c. input voltage across the input terminals thereof, wherein the amplitude of the d.c. output voltage from said voltage from said converter is a multiple of the peak value of the a.c. input voltage to said a.c. converter, said converter providing galvanic connections between the input terminals of said device and one of said line terminals, a second protective casing disposed about and completely enclosing said first protective casing and said device and said metal wall structure, insulators disposed between said second protective casing and said converter and insulating said converter galvanically from said second protective casing, and means galvanically interconnecting said first protective casing to said second protective casing and to ground potential.