US3644918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrating circuit using a programmable unijunction transistor
Assignee: Bosch Security Systems Inc
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Filing: 1969-12-16
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Granted: 1972-02-22
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Expires: 1989-12-16
Abstract
Abstract A unique integrating circuit adapted for use in conditionresponsive systems for preventing false alarming due to a series of rapidly occurring transient signals. A programmable unijunction transistor is used to rapidly discharge the capacitive element of the integrator in response to a slight decrease in input signal.
Inventors
- 👤 David E Perlman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:25
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
A condition-responsive system for monitoring a normally stable condition for changes therein, said system comprising: a condition-sensing circuit capable of providing an output in response to a change in said normally stable condition; an alarm component having an input and being actuateable in response to an electrical signal in excess of a predetermined level appearing on said input; and an integrating circuit having an input connected with the output of said condition-sensing circuit and an output connected with the input to said alarm component, said integrating circuit comprising a resistive element, a capacitive element which is chargeable by the output of said condition-sensing circuit, and a programmable unijunction transistor arranged with the gate and anode leads thereof connected across said resistive element and with the anode and cathode leads thereof connected across said capacitive element.
Claim 2
Dependent Claim
135 words
A condition-responsive system for monitoring a normally stable condition for changes therein, said system comprising: a condition-sensing circuit capable of providing an output in response to a change in said normally stable condition; an alarm component having an input and being actuateable in response to an electrical signal in excess of a predetermined level appearing on said input; and an integrating circuit having an input connected with the output of said condition-sensing circuit and an output connected with the input to said alarm component, said integrating circuit comprising a resistive element, a capacitive element which is chargeable by the output of said condition-sensing circuit, and a programmable unijunction transistor arranged with the gate and anode leads thereof connected across said resistive element and with the anode and cathode leads thereof connected across said capacitive element.
Claim 3
Dependent Claim
143 words
A condition-responsive system for monitoring a normally stable condition for changes therein, said system comprising: a condition-sensing circuit capable of providing an output in response to a change in said normally stable condition; an alarm component having an input and being actuateable in response to an electrical signal in excess of a predetermined level appearing on said input; and an integrating circuit connecting the output of said condition-sensing circuit with the input of said alarm component, said integrating circuit comprising resistive and capacitive elements, a PNP-transistor, and an NPN-transistor, said PNP-transistor having its base and collector leads connected with the collector and base leads, respectively, of said NPN-transistor, said transistors being arranged in said integrating circuit with the base and emitter leads of said PNP-transistor connected across said resistive element, and with the emitter leads of both transistors connected across said capacitive element.
Claim 4
Dependent Claim
143 words
A condition-responsive system for monitoring a normally stable condition for changes therein, said system comprising: a condition-sensing circuit capable of providing an output in response to a change in said normally stable condition; an alarm component having an input and being actuateable in response to an electrical signal in excess of a predetermined level appearing on said input; and an integrating circuit connecting the output of said condition-sensing circuit with the input of said alarm component, said integrating circuit comprising resistive and capacitive elements, a PNP-transistor, and an NPN-transistor, said PNP-transistor having its base and collector leads connected with the collector and base leads, respectively, of said NPN-transistor, said transistors being arranged in said integrating circuit with the base and emitter leads of said PNP-transistor connected across said resistive element, and with the emitter leads of both transistors connected across said capacitive element.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |