US3575427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite abradable seal
Assignee: RTX Corp
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Filing: 1969-11-03
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Granted: 1971-04-20
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Expires: 1989-11-03
Abstract
Abstract An abradable type seal for turbomachinery which utilizes a composite material consisting of a resilient bonding material and a friable insert construction to achieve the desired abradability. This application is reportable as a Subject Invention under Government Contract AF 33(657)14903.
Inventors
- 👤 Edward F Lapac
- 👤 Byron H Shinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:01
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F16; F16J; F16J15/00; F16J15/44; F16J15/445; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/937
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
An abradable-type fluid seal for a turbomachine, the turbomachine including two members capable of relative rotational movement, at least one of said members having an abradable rubbing contact area wherein the improvement comprises; the abradable rubbing contact area consisting of a mixture of essentially, by weight, 20 + OR - 5 percent of a friable material and 80 + OR - 5 percent of a resilient bonding material; said friable material being a plurality of hollow glass members dispersed throughout the resilient bonding material.
Claim 2
Dependent Claim
84 words
An abradable-type fluid seal for a turbomachine, the turbomachine including two members capable of relative rotational movement, at least one of said members having an abradable rubbing contact area wherein the improvement comprises; the abradable rubbing contact area consisting of a mixture of essentially, by weight, 20 + OR - 5 percent of a friable material and 80 + OR - 5 percent of a resilient bonding material; said friable material being a plurality of hollow glass members dispersed throughout the resilient bonding material.
Claim 3
Dependent Claim
17 words
An abradable-type fluid seal as in claim 1 wherein; the hollow glass members are spherical in shape.
Claim 4
Dependent Claim
27 words
An abradable-type fluid seal as in claim 1 wherein; the diameter of each of the hollow glass spheres is in the range of 10 to 300 microns.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |