US4247258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite wind turbine blade
Assignee: RTX Corp
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Filing: 1978-11-13
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Granted: 1981-01-27
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Expires: 1998-11-13
Abstract
Abstract A blade for a wind turbine has a shell of nonuniform wall thickness and is fabricated by helically winding in a single pass a plurality of turns of a filament-reinforced tape around a form with each successive turn of the tape overlapping the preceding one in an amount sufficient to establish desired thickness, the thickness varying along the length of the blade.
Inventors
- 👤 Donald G. Griffee, Jr.
- 👤 Chester J. Gruska, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:21
CPC Classifications
B; B32; B32B; B32B1/00; B32B1/08; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/60; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/32; B32B27/00; B32B27/06; B32B27/08; F; F03; F03D; F03D1/00; F03D1/06; F03D1/065; B32B2309/00; B32B2309/06; B32B2603/00; F05; F05B; F05B2240/00; F05B2240/20; F05B2240/30; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
54 words
A wind turbine blade tapering from base to tip including a hollow shell having a wall of nonuniform thickness, said shell wall comprising a plurality of overlapping turns of filament-reinforced tape of selected tape lead disposed as a single layer, said tape lead varying from said base to said tip to establish said thickness.
Claim 2
Dependent Claim
54 words
A wind turbine blade tapering from base to tip including a hollow shell having a wall of nonuniform thickness, said shell wall comprising a plurality of overlapping turns of filament-reinforced tape of selected tape lead disposed as a single layer, said tape lead varying from said base to said tip to establish said thickness.
Claim 3
Dependent Claim
14 words
The invention of claim 1 wherein said wall thickness diminishes from base to tip.
Claim 4
Dependent Claim
15 words
The invention of claim 2 wherein the lead angle of said tape is essentially 90°.
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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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |