Patent US3378829A successfully refreshed from Google Patents.
US3378829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire warning device
Assignee: BERKELEY SCIENT LAB
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Filing: 1965-04-02
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Granted: 1968-04-16
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Expires: 1985-04-02
Abstract
No abstract record available.
Inventors
- 👤 Alafi Moshe
- 👤 Birnbaum Wallace
- 👤 Franklin C Ford
- 👤 Charles S Godfrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:49
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
APPARATUS FOR GENERATING AT ONE LOCATION SIGNALS INDICATIVE OF A PREDETERMINED TEMPERATURE BEING EXCEEDED AND FOR TRANSMITTING THESE ALONG THE POWER LINES TO A SECOND LOCATION FOR DETECTION THEREAT COMPRISING MEANS FOR GENERATING A SIGNAL HAVING A PREDETERMINED VALUE WHEN THE TEMPERATURE OF SAID MEANS EXCEEDS SAID PREDETERMINED VALUE INCLUDING A THERMISTOR, A FIRST RESISTOR CONNECTED IN SERIES WITH SAID THERMISTOR, AND MEANS FOR APPLYING OPERATING POTENTIAL ACROSS SAID SERIALLY CONNECTED RESISTOR AND THERMISTOR, OSCILLATOR MEANS INOPERATIVE EXCEPT IN THE PRESENCE OF SAID PREDETERMINED VOLTAGE COMPRISING A UNIJUNCTION TRANSISTOR HAVING A FIRST AND A SECOND BASE AND AN EMITTER, MEANS FOR APPLYING OPERATING POTENTIAL ACROSS A FIRST AND SECOND BASE OF SAID UNIJUNCTION TRANSISTOR, A SECOND RESISTOR, A CAPACITOR CONNECTED IN SERIES WITH SAID SECOND RESISTOR, MEANS FOR APPLYING OPERATING POTENTIAL ACROSS SAID RESISTOR AND SECOND CAPACITOR, MEANS CONNECTING THE JUNCTION OF SAID SECOND RESISTOR AND CAPACITOR TO SAID UNIJUNCTION EMITTER, AND DIODE MEANS CONNECTING SAID JUNCTION BETWEEN SAID THERMISTOR AND FIRST RESISTOR TO THE JUNCTION BETWEEN SAID SECOND RESISTOR AND CAPACITOR, AND MEANS FOR APPLYING THE OUTPUT OF SAID OSCILLATOR MEANS TO SAID POWER LINES.
Claim 2
Dependent Claim
186 words
APPARATUS FOR GENERATING AT ONE LOCATION SIGNALS INDICATIVE OF A PREDETERMINED TEMPERATURE BEING EXCEEDED AND FOR TRANSMITTING THESE ALONG THE POWER LINES TO A SECOND LOCATION FOR DETECTION THEREAT COMPRISING MEANS FOR GENERATING A SIGNAL HAVING A PREDETERMINED VALUE WHEN THE TEMPERATURE OF SAID MEANS EXCEEDS SAID PREDETERMINED VALUE INCLUDING A THERMISTOR, A FIRST RESISTOR CONNECTED IN SERIES WITH SAID THERMISTOR, AND MEANS FOR APPLYING OPERATING POTENTIAL ACROSS SAID SERIALLY CONNECTED RESISTOR AND THERMISTOR, OSCILLATOR MEANS INOPERATIVE EXCEPT IN THE PRESENCE OF SAID PREDETERMINED VOLTAGE COMPRISING A UNIJUNCTION TRANSISTOR HAVING A FIRST AND A SECOND BASE AND AN EMITTER, MEANS FOR APPLYING OPERATING POTENTIAL ACROSS A FIRST AND SECOND BASE OF SAID UNIJUNCTION TRANSISTOR, A SECOND RESISTOR, A CAPACITOR CONNECTED IN SERIES WITH SAID SECOND RESISTOR, MEANS FOR APPLYING OPERATING POTENTIAL ACROSS SAID RESISTOR AND SECOND CAPACITOR, MEANS CONNECTING THE JUNCTION OF SAID SECOND RESISTOR AND CAPACITOR TO SAID UNIJUNCTION EMITTER, AND DIODE MEANS CONNECTING SAID JUNCTION BETWEEN SAID THERMISTOR AND FIRST RESISTOR TO THE JUNCTION BETWEEN SAID SECOND RESISTOR AND CAPACITOR, AND MEANS FOR APPLYING THE OUTPUT OF SAID OSCILLATOR MEANS TO SAID POWER LINES.
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) | 1971-04-16 | 1971-10-16 | 1972-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-16 | 1975-10-16 | 1976-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-16 | 1979-10-16 | 1980-04-16 | $7700.00 | Window Closed / Lapsed |