US3981616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow composite compressor blade
Assignee: United States Department of the Air Force
•
Filing: 1974-10-22
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Granted: 1976-09-21
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Expires: 1994-10-22
Abstract
Abstract A hollow composite compressor blade having two airfoil-shaped half sections formed of composite material bonded together, one or more span members of metal or composite material bonded and integral therewith and an appropriate root structure. The composite material being preferably silicon carbide coated boron filament with an aluminum matrix for the shell.
Inventors
- 👤 Hans Stargardter
- 👤 Walter Pilpel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:34
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/147; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
161 words
A hollow composite compressor blade having an airfoil planform comprising a root section, a pair of upstanding panels made of composite material extending from said root section, said panels forming a cavity therebetween, said panels having an insert located between adjacent panels at the leading edge of said blade and an insert located between adjacent panels at the trailing edge of said blade for securely joining said panels together, a central spar made of composite material and being of unitary construction with and extending in the longitudinal direction from said root section intermediate said panels, said spar terminating in a V-shaped configuration in said longitudinal direction, said V-shaped configuration having a pair of sides and a base, the sides of said V-shaped configuration being in direct contact with said pair of upstanding panels and the base of said V-shaped configuration being located substantially midway between said pair of panels in the transverse direction thereby providing a lightweight, extremely strong blade structure.
Claim 2
Dependent Claim
161 words
A hollow composite compressor blade having an airfoil planform comprising a root section, a pair of upstanding panels made of composite material extending from said root section, said panels forming a cavity therebetween, said panels having an insert located between adjacent panels at the leading edge of said blade and an insert located between adjacent panels at the trailing edge of said blade for securely joining said panels together, a central spar made of composite material and being of unitary construction with and extending in the longitudinal direction from said root section intermediate said panels, said spar terminating in a V-shaped configuration in said longitudinal direction, said V-shaped configuration having a pair of sides and a base, the sides of said V-shaped configuration being in direct contact with said pair of upstanding panels and the base of said V-shaped configuration being located substantially midway between said pair of panels in the transverse direction thereby providing a lightweight, extremely strong blade structure.
Claim 3
Dependent Claim
31 words
A hollow composite compressor blade having an airfoil planform as defined in claim 1 wherein said composite material is made of a silicon carbide coated boron filament with an aluminum matrix.
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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) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |