US3221320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas alarm circuit
Assignee: Komyo Rikagaku Kogyo KK
•
Filing: 1962-03-09
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Granted: 1965-11-30
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Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
- 👤 Yoneda Tokihiko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:23
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/18; G01N27/185; G08; G08B; G08B17/00; G08B17/10; G08B17/117
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A GAS ALARM ARRANGEMENT, COMPRISING IN COMBINATION; A GAS DETECTION CIRCUIT PROVIDING AN OUTPUT HAVING A PREDETERMINED VALUE UPON DETECTING A PARTICULAR GAS; AN OSCILLATION CIRCUIT COUPLED TO SAID DETECTION CIRCUIT, INCLUDING ON ITS INPUT SIDE A SEMICONDUCTOR DIODE HAVING A NEGATIVE RESISTANCE REGION AND ACCOMPLISHING A SWITCHING OPERATION UPON RECEIVING AN INPUT OVER THE PEAK POINT THEREOF, SAID DIODE PASSING CURRENT UPON RECEIVING AN INPUT EXCEEDING SAID PEAK POINT, SAID OSCILLATION CIRCUIT SUPPLY A SIGNAL IN RESPONSE TO THE ACTION OF SAID DIODE; AMPLIFYING MEANS COUPLED TO THE OUTPUT OF SAID OSCILLATION CIRCUIT RECEIVING AND AMPLIFYING SAID SIGNAL; AND ALARM GIVING MEANS RESPONSIVE TO SAID AMPLIFYING MEANS PROVIDING AN ALARM IN RESPONSE TO SAID AMPLIFIED SIGNAL.
Claim 2
Dependent Claim
117 words
A GAS ALARM ARRANGEMENT, COMPRISING IN COMBINATION; A GAS DETECTION CIRCUIT PROVIDING AN OUTPUT HAVING A PREDETERMINED VALUE UPON DETECTING A PARTICULAR GAS; AN OSCILLATION CIRCUIT COUPLED TO SAID DETECTION CIRCUIT, INCLUDING ON ITS INPUT SIDE A SEMICONDUCTOR DIODE HAVING A NEGATIVE RESISTANCE REGION AND ACCOMPLISHING A SWITCHING OPERATION UPON RECEIVING AN INPUT OVER THE PEAK POINT THEREOF, SAID DIODE PASSING CURRENT UPON RECEIVING AN INPUT EXCEEDING SAID PEAK POINT, SAID OSCILLATION CIRCUIT SUPPLY A SIGNAL IN RESPONSE TO THE ACTION OF SAID DIODE; AMPLIFYING MEANS COUPLED TO THE OUTPUT OF SAID OSCILLATION CIRCUIT RECEIVING AND AMPLIFYING SAID SIGNAL; AND ALARM GIVING MEANS RESPONSIVE TO SAID AMPLIFYING MEANS PROVIDING AN ALARM IN RESPONSE TO SAID AMPLIFIED SIGNAL.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |