Patent US3119453A successfully refreshed from Google Patents.
US3119453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor blade
Assignee: Bell Aerospace Corp
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Filing: 1960-12-02
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Granted: 1964-01-28
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Expires: 1980-12-02
Abstract
No abstract record available.
Inventors
- 👤 Jr Chester R Haig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:38
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473; B64C27/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
A HELICOPTER ROTOR BLADE COMPRISING A SOLID METAL MEMBER HAVING AN ELLIPSOIDAL SHAPED LEADING EDGE PORTION AND A SUBSTANTIALLY FLAT THIN TAPERING TRAILING EDGE PORTION FAIRED INTO SAID LEADING EDGE PORTION, SAID TRAILING EDGE PORTION BEING OF A CHRODWISE LENGTH SUBSTANTIALLY TWICE THAT OF THE MAJOR DIMENSION OF SAID LEADING EDGE PORTION AND BEING DISPOSED RELATIVE TO SAID LEADING EDGE PORTION SO THAT THE CENTER OF GRAVITY OF THE BLADE CROSS SECTION IS PROXIMATE TO THE AERODYNAMIC CENTER OF THE BLADE.
References Cited (Backward Citations)
CA563614A
Cited
US1470017A
Cited
GB221791A
Cited
FR643308A
Cited
US2044294A
Cited
US2682925A
Cited
US2754918A
Cited
US2712356A
Cited
US2938585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-27 | 1967-07-29 | 1968-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-27 | 1971-07-29 | 1972-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-27 | 1975-07-29 | 1976-01-28 | $7700.00 | Window Closed / Lapsed |