US3701622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excess smoke eliminating system for boilers
Assignee: Individual
•
Filing: 1970-11-23
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Granted: 1972-10-31
•
Expires: 1990-11-23
Abstract
Abstract A SYSTEM TO DETECT EXCESS SMOKE IN THE SMOKE STACK OF AN OIL-FIRED INDUSTRIAL BOILER AND TO AUTOMATICALLY REDUCE THE OIL SUPPLY TO THE BURNER OF THE BOILER WHILE ALLOWING SAID BURNER TO CONTINUE TO OPERATE, THUS ELIMINATING EXCESS SMOKE WHICH WOULD OTHERWISE BE DISCHARGED THROUGH THE SMOKE STACK.
Inventors
- 👤 Viateur Ducasse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:56
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/003
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |