US3156908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame responsive apparatus
Assignee: Viking Corp
•
Filing: 1961-12-04
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Granted: 1964-11-10
•
Expires: 1981-12-04
Abstract
No abstract record available.
Inventors
- 👤 Raymond I Kopan
- 👤 Donald R Cleary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:22
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN FIRE DETECTING APPARATUS OF THE TYPE HAVING PHOTORESISTIVE CELLS ADAPTED TO PROVIDE A FLUCTUATING SIGNAL IN RESPONSE TO LOW FREQUENCY FLUCTUATING INFRARED RADIATION IMPINGING THEREON, SAID SIGNAL BEING OF A MAGNITUDE TO INDUCE A FIRE SIGNAL, A CIRCUIT MONITORING NETWORK COMPRISING, AN OSCILLATOR ADAPTED TO CONTINUOUSLY IMPRESS A LOW FREQUENCY MONITOR SIGNAL ONTO THE CELL OUTPUT OF SMALLER MAGNITUDE THAN SAID FIRST NAMED MAGNITUDE BUT WITHIN THE CORRECT FREQUENCY RANGE TO INDUCE A FIRE SIGNAL, AND MEANS ADAPTED TO PRODUCE A SIGNAL IN RESPONSE TO THE INTERRUPTION OF MONITOR SIGNAL TRANSMISSION THROUGH SAID APPARATUS.
Claim 2
Dependent Claim
95 words
IN FIRE DETECTING APPARATUS OF THE TYPE HAVING PHOTORESISTIVE CELLS ADAPTED TO PROVIDE A FLUCTUATING SIGNAL IN RESPONSE TO LOW FREQUENCY FLUCTUATING INFRARED RADIATION IMPINGING THEREON, SAID SIGNAL BEING OF A MAGNITUDE TO INDUCE A FIRE SIGNAL, A CIRCUIT MONITORING NETWORK COMPRISING, AN OSCILLATOR ADAPTED TO CONTINUOUSLY IMPRESS A LOW FREQUENCY MONITOR SIGNAL ONTO THE CELL OUTPUT OF SMALLER MAGNITUDE THAN SAID FIRST NAMED MAGNITUDE BUT WITHIN THE CORRECT FREQUENCY RANGE TO INDUCE A FIRE SIGNAL, AND MEANS ADAPTED TO PRODUCE A SIGNAL IN RESPONSE TO THE INTERRUPTION OF MONITOR SIGNAL TRANSMISSION THROUGH SAID APPARATUS.
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) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |