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Patent US2760740A successfully refreshed from Google Patents.
US2760740A
Expired / Lapsed
US
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Wing tip mounted combustion heater
Assignee: Douglas Aircraft Co Inc
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Filing: 1951-08-01
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Granted: 1956-08-28
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Expires: 1971-08-01
Abstract
No abstract record available.
Inventors
- 👤 Warren A Brass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:46
CPC Classifications
B; B64; B64D; B64D15/00; B64D15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1879717A
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US1924122A
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US2264297A
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FR872789A
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US2374441A
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US2425630A
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US2421699A
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US2498283A
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US2584961A
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US2537369A
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US2547226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-28 | 1960-02-27 | 1960-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-28 | 1964-02-27 | 1964-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-28 | 1968-02-27 | 1968-08-28 | $7700.00 | Window Closed / Lapsed |