US3103977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerodynamic surfaces, and particularly helicopter blades
Assignee: Sud Aviation Societe Nationale de Constructions Aerdnaettiques
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Filing: 1961-11-21
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Granted: 1963-09-17
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Expires: 1981-11-21
Abstract
No abstract record available.
Inventors
- 👤 Negroni Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:50
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A HELICOPTER BLADE HAVING A SINGLE HOLLOW METAL SPAR OF SUBSTANTIALLY CONSTANT OUTER SECTION AND OF PROGRESSIVELY DECREASING THICKNESS, FILLER MATERIAL OF LESSER DENSITY THAN SAID SPAR AND ADHERENT THERETO TO PROVIDE AN OUTER SHAPE FOR THE BLADE AND A LEADING EDGE PORTION ADAPTED FOR CONNECTION TO THE FILLER MATERIAL, THE IMPROVEMENT ACCORDING TO WHICH THE SPAR IS SUBSTANTIALLY OF TRAPEZOIDAL SHAPE AND HAS LONGER SIDES EXTENDING IN THE CHORDWISE DIRECTION OF THE BLADE, SAID SPAR EXTENDING FOR THE GREATER PART OF THE HEIGHT OF THE BLADE AT THE FRONT OF THE BLADE ADJACENT SAID LEADING EDGE PORTION.
Claim 2
Dependent Claim
99 words
IN A HELICOPTER BLADE HAVING A SINGLE HOLLOW METAL SPAR OF SUBSTANTIALLY CONSTANT OUTER SECTION AND OF PROGRESSIVELY DECREASING THICKNESS, FILLER MATERIAL OF LESSER DENSITY THAN SAID SPAR AND ADHERENT THERETO TO PROVIDE AN OUTER SHAPE FOR THE BLADE AND A LEADING EDGE PORTION ADAPTED FOR CONNECTION TO THE FILLER MATERIAL, THE IMPROVEMENT ACCORDING TO WHICH THE SPAR IS SUBSTANTIALLY OF TRAPEZOIDAL SHAPE AND HAS LONGER SIDES EXTENDING IN THE CHORDWISE DIRECTION OF THE BLADE, SAID SPAR EXTENDING FOR THE GREATER PART OF THE HEIGHT OF THE BLADE AT THE FRONT OF THE BLADE ADJACENT SAID LEADING EDGE PORTION.
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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) | 1966-09-16 | 1967-03-18 | 1967-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-16 | 1971-03-18 | 1971-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-16 | 1975-03-18 | 1975-09-17 | $7700.00 | Window Closed / Lapsed |