US3676042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater ignition system
Assignee: Southern California Gas Co
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Filing: 1970-06-25
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Granted: 1972-07-11
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Expires: 1990-06-25
Abstract
Abstract A SIMPLE IGNITION SYSTEM FOR A SPACE HEATER OR THE LIKE IS PROVIDED WHEREIN GAS OR SIMILAR FUEL FLOW IS CONTROLLED BY A SOLENOID VALVE. A HEAT SENSITIVE SWITCH AND AN AIR FLOW SENSITIVE SWITCH ARE SERIALLY CONNECTED TO THE SOLENOID VALVE FOR PREVENTING GAS FLOW IN THE ABSENCE OF IGNITION OR AIR FLOW, RESPECTIVELY. AN ELECTRIC GLOW IGNITER ADJACENT THE HEAT SENSITIVE SWITCH INITIATES COMBUSTION AND IS DISCONNECTED AFTER IGNITION FOR PROLONGED LIFE. IF DESIRED, A TIME DELAY FOR DISABLING THE HEATER IN THE ABSENCE OF IGNITION CAN BE EMPLOYED IF, FOR EXAMPLE, THE HEATER IS A NONSEALED SYSTEM.
Inventors
- 👤 Keith Osborne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:40
CPC Classifications
F; F23; F23Q; F23Q7/00; F23Q7/06; F23Q7/10; F23Q7/12; F23N; F23N5/00; F23N5/20; F23N2227/00; F23N2227/38; F23N2227/42; F23N2233/00; F23N2233/06
Claims Analysis
Total Claims: 0
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |