US3880550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Outer seal for first stage turbine
Assignee: United States Department of the Air Force
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Filing: 1974-02-22
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Granted: 1975-04-29
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Expires: 1994-02-22
Abstract
Abstract An outer air seal for the first stage turbine of an engine having the seal segments made of a high strength base material with a highly oxidation-corrosion resistant abradable alloy layer bonded to the surface thereof on the side adjacent the rotor blade. Another embodiment having an abrasive layer bonded to the high strength base material with the abradable layer being bonded to the abrasive layer.
Inventors
- 👤 Arthur F Corey
- 👤 Bruce E Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:44
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; Y; Y10; Y10S; Y10S277/00; Y10S277/922
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
An outer seal for the first stage of a turbine engine, comprising an annular seal segment support member surrounding the blades of the first stage of the turbine engine; a plurality of seal segments supported on the seal segment support member; said seal segments having a layer of PWA 1045 sheet material bonded to a high strength Nickel-Chrominum alloy base material.
Claim 2
Dependent Claim
61 words
An outer seal for the first stage of a turbine engine, comprising an annular seal segment support member surrounding the blades of the first stage of the turbine engine; a plurality of seal segments supported on the seal segment support member; said seal segments having a layer of PWA 1045 sheet material bonded to a high strength Nickel-Chrominum alloy base material.
Claim 3
Dependent Claim
16 words
The device as recited in claim 1 wherein the high strength base material is PWA 663.
Claim 4
Dependent Claim
16 words
The device as recited in claim 1 wherein the high strength base material is PWA 647.
Claim 5
Dependent Claim
31 words
The device as recited in claim 1 wherein an abrasive layer of WS-6 is bonded to the high strength base material between the base material and the sheet of PWA 1045.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |