US2639775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotative wing aircraft
Assignee: Individual
•
Filing: 1946-08-14
•
Granted: 1953-05-26
•
Expires: 1966-08-14
Abstract
No abstract record available.
Inventors
- 👤 William E Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:33
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/37; B64C27/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR631596A
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FR34123E
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US1764381A
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US1987650A
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FR798323A
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US2216164A
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US2247034A
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US2264942A
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US2263304A
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US2256918A
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US2261387A
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US2336579A
Cited
US2376523A
Cited
US2457429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |