Patent US4107501A successfully refreshed from Google Patents.
US4107501A
Expired / Lapsed
US
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Microwave oven control system
Assignee: Raytheon Co
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Filing: 1976-04-13
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Granted: 1978-08-15
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Expires: 1996-04-13
Abstract
Abstract A microwave oven system in which a magnetron supplies microwave energy to a microwave oven through an isolator structure comprising a three-port circulator having a microwave energy absorbing load coupled to the third port, with the temperature of said load being sensed by a first switch actuated at a first temperature level to maintain a flow of air across the load continuously between operating cycles of the oven and by a second thermally operated switch actuated at a higher temperature to disable the power supply for the magnetron.
Inventors
- 👤 Richard Ironfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:40
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/74; H05B6/745; H05B6/6402; H05B6/642; H05B6/6447; H05B6/645; H05B6/647; H05B6/6491; H05B6/6494
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
146 words
A microwave oven comprising: a microwave energy generator for supplying microwave energy to a heating cavity; a source of power for said microwave generator; means coupled between the output of said microwave generator and said cavity for substantially preventing the supply of microwave energy from said cavity to said microwave generator, comprising a microwave ferite circulator and a microwave energy absorber; a first thermal sensor responsive to a first temperature of said microwave energy absorber for maintaining a flow of a cooling fluid past said microwave energy absorber when said microwave energy generator is de-energized; a timing control for energizing said source of power and for maintaining said flow when said microwave energy generator source of power is energized; and a second thermal sensor responsive to a second predetermined temperature of said absorber for preventing the energization of said source of power by said timing control.
Claim 2
Dependent Claim
146 words
A microwave oven comprising: a microwave energy generator for supplying microwave energy to a heating cavity; a source of power for said microwave generator; means coupled between the output of said microwave generator and said cavity for substantially preventing the supply of microwave energy from said cavity to said microwave generator, comprising a microwave ferite circulator and a microwave energy absorber; a first thermal sensor responsive to a first temperature of said microwave energy absorber for maintaining a flow of a cooling fluid past said microwave energy absorber when said microwave energy generator is de-energized; a timing control for energizing said source of power and for maintaining said flow when said microwave energy generator source of power is energized; and a second thermal sensor responsive to a second predetermined temperature of said absorber for preventing the energization of said source of power by said timing control.
Claim 3
Dependent Claim
19 words
The microwave oven in accordance with claim 1 wherein said first and second temperature sensors comprise thermally actuated switches.
Claim 4
Dependent Claim
59 words
The microwave oven in accordance with claim 2 wherein said circulator comprises a three-port circulator having said microwave energy coupled from said generator to said cavity through first and second ports of said circulator and having microwave energy reflected from said cavity toward said generator coupled through second and third ports of said circulator to said microwave energy absorber.
Claim 5
Dependent Claim
135 words
A microwave oven comprising: a microwave energy generator for supplying microwave energy to a heating cavity; means coupled between the output of said microwave generator and said cavity for substantially preventing the supply of microwave energy from said cavity to said microwave generator comprising a microwave ferrite circulator and a microwave energy absorber; a first thermal sensor responsive to a first temperature of said microwave energy absorber for maintaining a flow of a cooling fluid past said microwave energy absorber when said microwave energy generator is de-energized; a timing control for energizing said microwave energy generator and for maintaining said flow when said microwave energy generator is energized; and a second thermal sensor responsive to a second predetermined temperature of said absorber for preventing the energization of said microwave energy generator by said timing control.
Claim 6
Dependent Claim
135 words
A microwave oven comprising: a microwave energy generator for supplying microwave energy to a heating cavity; means coupled between the output of said microwave generator and said cavity for substantially preventing the supply of microwave energy from said cavity to said microwave generator comprising a microwave ferrite circulator and a microwave energy absorber; a first thermal sensor responsive to a first temperature of said microwave energy absorber for maintaining a flow of a cooling fluid past said microwave energy absorber when said microwave energy generator is de-energized; a timing control for energizing said microwave energy generator and for maintaining said flow when said microwave energy generator is energized; and a second thermal sensor responsive to a second predetermined temperature of said absorber for preventing the energization of said microwave energy generator by said timing control.
Claim 7
Dependent Claim
157 words
A microwave oven comprising: a microwave energy generator for supplying microwave energy to a heating cavity; a waveguide coupled between the output of said microwave energy generator and said cavity; means for substantially preventing the supply of microwave energy from said cavity to said microwave generator comprising a three port microwave ferrite circulator in said waveguide and a microwave energy absorber coupled to a port of said circulator through an apertured wall of said waveguide; a first thermal sensor responsive to a first temperature of said microwave energy absorber for maintaining a flow of a cooling fluid past said microwave energy absorber when said microwave energy generator is de-energized; a timing control for energizing said microwave energy generator and for maintaining said flow when said microwave energy generator is energized; and a second thermal sensor responsive to a second predetermined temperature of said absorber for preventing the energization of said microwave energy generator by said timing control.
Claim 8
Dependent Claim
157 words
A microwave oven comprising: a microwave energy generator for supplying microwave energy to a heating cavity; a waveguide coupled between the output of said microwave energy generator and said cavity; means for substantially preventing the supply of microwave energy from said cavity to said microwave generator comprising a three port microwave ferrite circulator in said waveguide and a microwave energy absorber coupled to a port of said circulator through an apertured wall of said waveguide; a first thermal sensor responsive to a first temperature of said microwave energy absorber for maintaining a flow of a cooling fluid past said microwave energy absorber when said microwave energy generator is de-energized; a timing control for energizing said microwave energy generator and for maintaining said flow when said microwave energy generator is energized; and a second thermal sensor responsive to a second predetermined temperature of said absorber for preventing the energization of said microwave energy generator by said timing control.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-14 | 1982-02-13 | 1982-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-14 | 1986-02-13 | 1986-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-14 | 1990-02-13 | 1990-08-15 | $7700.00 | Window Closed / Lapsed |