Patent US3672809A successfully refreshed from Google Patents.
US3672809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid fuel burning heaters
Assignee: Aladdin Industries LLC
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Filing: 1971-02-12
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Granted: 1972-06-27
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Expires: 1991-02-12
Abstract
Abstract A LIQUID FUEL BURNING HEATER HAVING WICK FED RADIANT BURNER OF THE "SHORT DRUM"F TYPE, IS PROVIDED WITH AN EXTINGUISHING DEVICE WHICH IS OPERATIVE, UPON TILTING OF THE HEATER, TO RETRACT THE WICK AND CLOSE THE SPACE BETWEEN THE INNER AND OUTER WICK TUBES UNDER THE INFLUENCE OF A SPRING ACTING UPON A ROD, THE UPPEREND OF WHICH IS SECURED TO THE EXTINGUISHING DEVICE AND THE LOWER END OF WHICH ENGAGES THE GROUND WHEN THE HEATER IS STANDING UPRIGHT.
Inventors
- 👤 Hugh Charles Hebard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:34
CPC Classifications
F; F24; F24C; F24C5/00; F24C5/16
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |