Patent US3764832A successfully refreshed from Google Patents.
US3764832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic switch for timed load energization after trigger signal
Assignee: Novar Controls Corp
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Filing: 1972-06-29
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Granted: 1973-10-09
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Expires: 1992-06-29
Abstract
Abstract A burglar deterrent having a timing switch connected to the lights of a room or building for actuating these lights for a selected period of time in response to a sound made by an intruder. The timing switch has an SCR connected to the switch terminals. The gate of the SCR is connected to a timing circuit which comprises a series connected capacitance and diode connected from the gate to the anode of the SCR. A second SCR has its main terminals connected across the capacitance for, at times, discharging the capacitance in response to a trigger signal at the gate of the second SCR. A zener diode is connected for limiting the charging voltage applied to the capacitance. A variable resistance is connected from the gate of the first SCR to its cathode to permit selection and control of the delay time.
Inventors
- 👤 J Stettner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:38
CPC Classifications
G; G08; G08B; G08B15/00; G08B15/002; H; H03; H03K; H03K17/00; H03K17/13; H03K17/136; H03K17/28; H03K17/292
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
A timing switch, for connection to a load and to a source of power, for permitting a load energizing current flow through the load and for continuing the load energization for a selected peRiod of time, the switch comprising: a. an electronic switch means comprising a first thyristor having its main terminals connected at the timing switch terminals and having a gate operable as its control input terminal; b. a timing circuit comprising a series capacitance and rectifier connected at one end to said control terminal and conductively connected at the opposite end to a source of control input power, the rectifier being polarized to permit control input current flow; and c. capacitance discharging means connected across said capacitance for at times discharging the capacitance, said capacitance discharging means comprising a second thyristor having its main terminals connected across said capacitance and having its gate connected to receive a triggering signal for actuating said timing switch.
Claim 2
Dependent Claim
156 words
A timing switch, for connection to a load and to a source of power, for permitting a load energizing current flow through the load and for continuing the load energization for a selected peRiod of time, the switch comprising: a. an electronic switch means comprising a first thyristor having its main terminals connected at the timing switch terminals and having a gate operable as its control input terminal; b. a timing circuit comprising a series capacitance and rectifier connected at one end to said control terminal and conductively connected at the opposite end to a source of control input power, the rectifier being polarized to permit control input current flow; and c. capacitance discharging means connected across said capacitance for at times discharging the capacitance, said capacitance discharging means comprising a second thyristor having its main terminals connected across said capacitance and having its gate connected to receive a triggering signal for actuating said timing switch.
Claim 3
Dependent Claim
35 words
A timing switch according to claim 1 wherein a bleeder resistor is shunted across said second thyristor for extending the time delay by bleeding of less charge from the capacitance each cycle than is added.
Claim 4
Dependent Claim
33 words
A timing switch according to claim 1 wherein said first thyristor and said second thyristor are silicon controlled rectifiers and said timing circuit is connected to the anode terminal of said first thyristor.
Claim 5
Dependent Claim
35 words
A timing switch according to claim 3 wherein a variable resistance is connected between the gate terminal and the cathode terminal of said first thyristor for control of the time delay of said timing circuit.
Claim 6
Dependent Claim
23 words
A timing switch according to claim 3 wherein a zener diode is connected to limit the voltage applied to said series timing circuit.
Claim 7
Dependent Claim
25 words
A timing switch according to claim 5 wherein said zener diode is conductively connected across said capacitance for limiting the voltage applied to the capacitance.
Claim 8
Dependent Claim
28 words
A timing switch according to claim 5 wherein the zener diode is connected between a node of said timing circuit and the cathode terminal of said first thyristor.
Claim 9
Dependent Claim
35 words
A timing switch according to claim 5 wherein a variable resistance is connected between the gate terminal and the cathode terminal of said first thyristor for control of the time delay of said timing circuit.
Claim 10
Dependent Claim
32 words
A timing switch according to claim 8 wherein the zener voltage of said zener diode is relatively small compared to the maximum instantaneous voltage at the main terminals of said first thyristor.
Claim 11
Dependent Claim
79 words
An apparatus according to claim 1 wherein a. a triac has its principal terminals serially connected to said load and to said source of power and has a control gate terminal; b. a bridge rectifier circuit is connected at its bi-directional nodes to said gate terminal and a principal terminal of said triac; and c. said timing switch is connected to the unidirectional nodes of said bridge rectifier circuit, whereby said timing switch controls the firing of said triac.
References Cited (Backward Citations)
US3328606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |