USRE28013E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety switch and circuit por oil-burhing furnace
Assignee: —
•
Filing: 1972-06-26
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Granted: 1974-05-21
•
Expires: 1992-06-26
Abstract
Abstract OIL BURNING FURNACE DESIGNED TO NORMALLY OPERATE AS SUBATMOSPHERIC PRESSURE IN THE COMBUSTION CHAMBER HAS AN OPEN TUBE OPENING FROM THE COMBUSTION CHAMBER TO THE EXTERIOR OF THE FURNACE ADJACENT THE BURNER. A NORMALLY CLOSED HEAT RESPONSIVE FUSE OR SWITCH IS MOUNTED ADJACENT THE OUTER END OF THE TUBE, TO BE RESPONSIVE TO ABNORMAL BACK-FLOW OF HOT COMBUSTION GASES FROM THE FURNACE. THE FUSE OR SWITCH IS CONNECTED IN CONTROLLING RELATION TO THE CIRCUIT OF THE BURNER, TO SHUT OFF THE BURNER IF ABRORMAL BACK PRESSURE DEVELOPS IN THE COM- BUSTION CHAMBER. THE SWITCH AND TUBE ARE ADJUSTABLE TO VARY THE DEGREE OF SENSITIVITY OF SYSTEM TO BACK PRESSURE.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:52
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/04; F23N5/045; F23N2239/00; F23N2239/06
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |