US3572971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight turbo-machinery blading
Assignee: General Electric Co
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Filing: 1969-09-29
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Granted: 1971-03-30
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Expires: 1989-09-29
Abstract
Abstract The disclosure shows two lightweight, aerodynamic blades for use in lightweight compressors and, particularly, as stator vanes therefor. One blade comprises a core formed by bonded, longitudinally extending glass fibers, clad within a metallic skin bonded thereto. The other blade comprises a core of longitudinally extending, bonded graphite fibers, clad within a titanium skin of a selected thickness bonded thereto.
Inventors
- 👤 David L Seiwert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:52
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/282; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
A turbomachinery blade having an aerodynamic cross section and comprising: a central core formed by a multiplicity of thin fibers, characterized in that the fibers are densely compacted in a large number of layers and essentially all of the fibers extend lengthwise of the blade and are bonded together, thereby forming a solid structure; a relatively thin metal skin, clad about said core and bonded thereto and supported thereby in a boxlike, structural loadcarrying configuration; and whereby a turbomachinery blade as case in claim 1 wherein, the fibers of said core are formed of glass. stresses are carried primarily by the skin which is minimized in thickness and weight.
Claim 2
Dependent Claim
17 words
A turbomachinery blade as in claim 1 wherein, the fibers of said core are formed of glass.
Claim 3
Dependent Claim
24 words
A turbomachinery blade as in claim 2 wherein, the thickness of the skin is the minimum necessary to withstand longitudinal stresses on the blade.
Claim 4
Dependent Claim
27 words
A turbomachinery blade as in claim 1 wherein, the modulus of elasticity of the skin metal approximates or is less than that of the composite fiber core.
Claim 5
Dependent Claim
25 words
A turbomachinery blade as in claim 4 wherein, the thickness of the metal skin is the minimum necessary to withstand transverse loadings on the blade.
Claim 6
Dependent Claim
18 words
A turbomachinery blade as in claim 4 wherein, the skin is titanium and the core fibers are graphite.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |