Temporary memory restore circuit for multivibrator

Claim 2

A temporary memory restore circuit for a multivibrator circuit having a pair of electronic control devices each including first, second, and control electrodes; said first electrodes being coupled to a first electrical potential; said second electrodes being connected to a second electrical potential; each said first electrode being coupled to the control electrode of said other control device to define a multivibrator circuit so that said two control devices alternate between conductive and nonconductive stable states; the improvement in said memory restore circuit for restoring a said multivibrator circuit to its last stable state after power for at least one of said potentials has been removed and replaced, including: a storage capacitor having a first and second terminal and beiNg of nonremanent polarization after a given time upon removal of power; said capacitor providing a direct current voltage output signal of a polarity in accordance with its state of polarization and, then substantially discharging after said given time; a first normally open circuit means for connecting said capacitor across said first electrodes of said electronic control devices; and a first actuatable means for, upon actuation, closing said first normally open circuit means for charging said capacitor in accordance with the last stable state of said multivibrator circuit and for applying said output signal to said multivibrator circuit so that after said power is returned the said multivibrator circuit is actuated to its last stable state.

Claim 3

A temporary memory restore circuit as defined in claim 1 including a second normally open circuit means for connecting said capacitor across said first electrodes of said control devices; said first normally open circuit means including a resistive element connected in series with said first circuit means; a second actuatable means for momentarily closing said second normally open circuit means upon actuation of said second actuatable means.

Claim 4

A temporary memory restore circuit as defined in claim 1 wherein said first normally open circuit means includes a first and a second terminal; said first terminal of said circuit means being connected to said first terminal of said capacitor and said second terminal of said circuit means being connected to one of said first electrodes; the other of said electrodes being connected to said second terminal of said capacitor.

Claim 5

A temporary memory restore circuit as defined in claim 3 wherein said second terminal of said first circuit means in connected through a resistive element to said one of said first electrodes; a second normally open circuit means having a first and a second terminal; said first terminal of said second circuit means being connected to said first terminal of said capacitor and said second terminal of said second circuit means being connected to said one of said first electrodes; and a second actuatable means for momentary closing said second normally open circuit means upon actuation of said second actuatable means.

Claim 6

A temporary memory restore circuit as defined in claim 4 wherein said first actuatable means includes a relay coil connected between said first and said second electrical potentials; and said second actuatable means includes in a relay coil connected in parallel with a second resistive element and in series with a capacitive element across said first and said second electrical potentials.

Claim 7

A temporary memory restore circuit as defined in claim 4 and wherein said first and said second actuatable means include a first and a second electronic control device respectively, each including a control electrode.

Claim 8

A temporary memory restore circuit as defined in claim 6 wherein said control electrode of said first actuatable means is connected through a second resistive element to said second electrical potential, and said control electrode of said second actuatable means is connected through a third resistive element to said first electrical potential, and through a second capacitive element to said second electrical potential.

Claim 9

A temporary memory restore circuit as defined in claim 7 including a switching means for disconnecting said second potential from said second capacitive element and said second resistive element so that the multivibrator circuit will be actuated to its last stable state upon energization of said switching means.

Claim 10

A temporary memory restore circuit as defined in claim 8 wherein said switching means includes a third transistor having a first electrode connected to said second capacitive element and said second resistive element, a second electrode connected to said second electrical potential, and a control electrode coupled to said first electrical potential.

Claim 11

A temporary memory restore circuit as defined in claim 9 wherein said control electrode is coupled to said first electrical potential through a third normally open circuit means so that said multivibrator circuit may be actuated to its last stable state upon closure of said third normally open circuit means.

Claim 12

A temporary memory restore circuit for a multivibrator circuit having a pair of electronic control devices each including first, second, and control electrodes; first and second electric potential supply terminals for connection to different electric potentials; said first electrodes being connected to said first terminal, said second electrodes being connected to said second terminal; each said first electrode being coupled to the control electrode of said other control device to define a multivibrator circuit so that said two control devices alternate between conductive and nonconductive stable states; the improvement in said memory restore circuit for restoring said multivibrator circuit to its last stable state after power for at least one of said potentials has been removed and replaced, including: a storage capacitor having a first and second terminal; said capacitor providing a direct current voltage output signal of a polarity in accordance with its state of polarization; a first normally open circuit means for connecting said capacitor across said first electrodes of said electronic control devices; and a first actuatable means for, upon actuation, closing said first normally open circuit means to connect said capacitor across said first electrodes of said electronic control devices and, upon deactuation, disconnecting said capacitor from across said first electrodes of said electronic control devices for, upon actuation charging said capacitor in accordance with said last stable state of said multivibrator circuit and for applying said output signal to said multivibrator circuit so that, after said power is returned, the said multivibrator circuit is actuated to its last stable state and, upon deactuation, said capacitor is prevented from discharging through said electrodes of said electronic control devices.

Claim 13

A temporary memory restore circuit for a multivibrator circuit having a pair of electronic control devices each including first, second, and control electrodes; first and second electric potential supply terminals for connection to different electric potentials; said first electrodes being connected to said first terminal, said second electrodes being connected to said second terminal; each said first electrode being coupled to the control electrode of said other control device to define a multivibrator circuit so that said two control devices alternate between conductive and nonconductive stable states; the improvement in said memory restore circuit for restoring said multivibrator circuit to its last stable state after power for at least one of said potentials has been removed and replaced, including: a storage capacitor having a first and second terminal; said capacitor providing a direct current voltage output signal of a polarity in accordance with its state of polarization; a first normally open circuit means for connecting said capacitor across said first electrodes of said electronic control devices; and a first actuatable means for, upon actuation, closing said first normally open circuit means to connect said capacitor across said first electrodes of said electronic control devices and, upon deactuation, disconnecting said capacitor from across said first electrodes of said electronic control devices for, upon actuation charging said capacitor in accordance with said last stable state of said multivibrator circuit and for applying said output signal to said multivibrator circuit so that, after said power is returned, the said multivibrator circuit is actuated to its last stable state and, upon deactuation, said capacitor is prevented from discharging through said electrodes of said electronic control devices.

Claim 14

A circuit as defined in claim 11, wherein said first actuatable means is connected to one of said electrical potential supply terminals, whereby said first actuatable means is actuated only while potential is supplied to said electrical potential supply terminals.