US2658575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor
Assignee: PETER T STONE
•
Filing: 1946-07-17
•
Granted: 1953-11-10
•
Expires: 1966-07-17
Abstract
No abstract record available.
Inventors
- 👤 Piotr F Lapidovsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:36
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)
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US2444070A
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US2450491A
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US2440225A
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US2415999A
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US2394846A
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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) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |