Patent US2869535A successfully refreshed from Google Patents.
US2869535A
Expired / Lapsed
US
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Aircraft heating system
Assignee: Fairchild Engine and Airplane Corp
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Filing: 1954-05-12
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Granted: 1959-01-20
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Expires: 1974-05-12
Abstract
No abstract record available.
Inventors
- 👤 Theodore H Horrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:55
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; B64D13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2187506A
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US2306096A
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US2383002A
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US2665055A
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US2479668A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |