US3556705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical ignition and control system for fuel burner
Assignee: Stewart Warner Corp
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Filing: 1969-10-08
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Granted: 1971-01-19
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Expires: 1989-10-08
Abstract
Abstract A TEMPERATURE RESPONSIVE SWITCHING CIRCUIT FOR A FUEL BURNER WHICH EMPLOYS AN ASSEMBLY OF RESISTANCES HAVING POSITIVE TEMPERATURE COEFFICIENTS RESISTANCE FOR INSURING A CONSTANT LOW VOLTAGE ACROSS THE BLOWER MOTOR AND THE RESISTANCE IGNITER DURING BURNER START-UP REGARDLESS OF VOLTAGE FLUCTUATION.
Inventors
- 👤 Jesse B Mellett
- 👤 Tilford W Sutterfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:52
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/20
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |