Patent US2740595A successfully refreshed from Google Patents.
US2740595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter with fuselage-encircling lift rotor means
Assignee: Individual
•
Filing: 1952-03-15
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Granted: 1956-04-03
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Expires: 1972-03-15
Abstract
No abstract record available.
Inventors
- 👤 Harding F Bakewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:10
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/08; B64C27/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1403624A
Cited
US1493280A
Cited
US1524266A
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US1800470A
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US1884596A
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US1868392A
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US1995460A
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US2077471A
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US2395809A
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US2410459A
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US2397489A
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US2377835A
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US2521684A
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US2461435A
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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) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |