Patent US3494424A successfully refreshed from Google Patents.
US3494424A
Expired / Lapsed
US
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Aircraft sustaining rotor system and rotor blade therefor
Assignee: Autogiro Company of America
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Filing: 1967-12-11
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Granted: 1970-02-10
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Expires: 1987-12-11
Abstract
No abstract record available.
Inventors
- 👤 Paul H Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:29
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18; B64C27/32; B64C27/46; B64C27/473
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3120274A
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US3096826A
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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) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |