Patent US3934889A successfully refreshed from Google Patents.
US3934889A
Expired / Lapsed
US
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Fire seal
Assignee: Rolls Royce PLC
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Filing: 1974-09-11
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Granted: 1976-01-27
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Expires: 1994-09-11
Abstract
Abstract A Fire seal is formed in three layers, an elastic inner tube which is inflatable, a resilient fire resistant felt surrounding the tube, and a wear resistant rubber impregnated outer layer.
Inventors
- 👤 Stanley Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:58
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/24; F02C7/25; F16; F16J; F16J15/00; F16J15/46; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
38 words
A fire seal comprising an elastic inner tube capable of being pressurised by fluid under pressure, a resilient intermediate layer of fire-resistant carbon felt surrounding said inner tube, and a wear resistant outer layer surrounding said intermediate layer.
Claim 2
Dependent Claim
38 words
A fire seal comprising an elastic inner tube capable of being pressurised by fluid under pressure, a resilient intermediate layer of fire-resistant carbon felt surrounding said inner tube, and a wear resistant outer layer surrounding said intermediate layer.
Claim 3
Dependent Claim
20 words
A fire seal according to claim 1 and wherein the inner tube comprises a silicone elastomer re-inforced with fibrous material.
Claim 4
Dependent Claim
24 words
A fire seal according to claim 1 and wherein the outer layer comprises a glass fibre wear resistant sleeve impregnated with a rubber material.
Claim 5
Dependent Claim
24 words
A fire seal according to claim 1 and wherein the outer layer comprises a glass fibre wear resistant sleeve coated with a rubber material.
Claim 6
Dependent Claim
61 words
A fire seal comprising an inner tube of a silicone elastomer material re-inforced with fibrous material and which is capable of being pressurised by fluid under pressure, the inner-tube being surrounded by an intermediate layer of a resilient fire-resistant carbon felt, the intermediate layer in turn being surrounded by a wear resistant sleeve of a glass fibre material impregnated with rubber.
Claim 7
Dependent Claim
61 words
A fire seal comprising an inner tube of a silicone elastomer material re-inforced with fibrous material and which is capable of being pressurised by fluid under pressure, the inner-tube being surrounded by an intermediate layer of a resilient fire-resistant carbon felt, the intermediate layer in turn being surrounded by a wear resistant sleeve of a glass fibre material impregnated with rubber.
Claim 8
Dependent Claim
56 words
A fire seal comprising an inner tube of a silicone elastomer material and which is capable of being pressurized by fluid under pressure, the inner tube being surrounded by an intermediate layer of a resilient fire resistant carbon felt, the intermediate layer in turn being surrounded by a wear resistant sleeve of a reinforced rubber material.
Claim 9
Dependent Claim
56 words
A fire seal comprising an inner tube of a silicone elastomer material and which is capable of being pressurized by fluid under pressure, the inner tube being surrounded by an intermediate layer of a resilient fire resistant carbon felt, the intermediate layer in turn being surrounded by a wear resistant sleeve of a reinforced rubber material.
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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |