US2638170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft propeller or rotor
Assignee: Individual
•
Filing: 1947-06-28
•
Granted: 1953-05-12
•
Expires: 1967-06-28
Abstract
No abstract record available.
Inventors
- 👤 Richard H Prewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:13
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2417647A
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US2427853A
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US2397450A
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US2430948A
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US2410056A
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US2460351A
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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) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |