US2761494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barometric draft regulator and burner control
Assignee: Individual
•
Filing: 1953-01-26
•
Granted: 1956-09-04
•
Expires: 1973-01-26
Abstract
No abstract record available.
Inventors
- 👤 Edward A Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:46
CPC Classifications
F; F23; F23N; F23N3/00; F23N3/08; F23N3/085; F23N2235/00; F23N2235/02; F23N2235/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1963073A
Cited
US2086617A
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US2130491A
Cited
US2090365A
Cited
US2145404A
Cited
US2650029A
Cited
US2692640A
Cited
US2682299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |