US2532841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace door operating mechanism
Assignee: SWINDELL DRESSLER CORP
•
Filing: 1947-04-22
•
Granted: 1950-12-05
•
Expires: 1967-04-22
Abstract
No abstract record available.
Inventors
- 👤 Edward A Hanff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:52
CPC Classifications
F; F23; F23M; F23M7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1314572A
Cited
US2045662A
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US2119426A
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US2199182A
Cited
US2254900A
Cited
US2494713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |