US2460983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airplane heater with altitude controlled combustion air feed
Assignee: Selas Corp of America
•
Filing: 1942-10-05
•
Granted: 1949-02-08
•
Expires: 1962-10-05
Abstract
No abstract record available.
Inventors
- 👤 Frederic O Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:56
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; B64D13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1558848A
Cited
US1779162A
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US2264869A
Cited
US2308887A
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US2308888A
Cited
US2289208A
Cited
US2286853A
Cited
US2314089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-08 | 1952-08-09 | 1953-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-08 | 1956-08-09 | 1957-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-08 | 1960-08-09 | 1961-02-08 | $7700.00 | Window Closed / Lapsed |