Patent US3133296A successfully refreshed from Google Patents.
Patent US3561900A successfully refreshed from Google Patents.
US3561900A
Expired / Lapsed
US
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Igniter system
Assignee: Fenwal Inc
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Filing: 1969-03-10
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Granted: 1971-02-09
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Expires: 1989-03-10
Abstract
Abstract THE ELECTRONIC IGNITER SYSTEM DISCLOSED HEREIN EMPLOYS A HIGH VOLTAGE SPARK GENERATING CIRCUIT WHICH IS ADAPTED TO PROVIDE IGNITING SPARKS TO PLURALITY OF BURNERS WHEN ANY ONE OF THE BURNERS IS TURNED ON, BUT NOT LIT. THE SPARK GENERATING CIRCUIT CAN BE TRIGGERING INTO OPERATION BY ANY ONE OF A PLURALITY OF TRIGGERING CIRCUITS, THERE BEING ONE TRIGGERING CIRCUIT FOR EACH BURNER. ASSOCIATED WITH EACH TRIGGERING CIRCUIT IS A MEANS FOR DISABLING THAT TRIGGERING CIRCUIT WHEN THE RESPECTIVE BURNER IS EITHER TURNED OFF OR IS LIT.
Inventors
- 👤 Lyman H Walbridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:57
CPC Classifications
F; F23; F23Q; F23Q3/00
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |