Patent US2627929A successfully refreshed from Google Patents.
US2627929A
Expired / Lapsed
US
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Helicopter rotor
Assignee: RTX Corp
•
Filing: 1947-03-26
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Granted: 1953-02-10
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Expires: 1967-03-26
Abstract
No abstract record available.
Inventors
- 👤 Igor I Sikorsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:12
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/22; B64C27/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1927966A
Cited
US1919089A
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US1895043A
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US1986709A
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US2397154A
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US2428200A
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US2415148A
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US2432677A
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US2397489A
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US2439089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |