Patent US3788651A successfully refreshed from Google Patents.
US3788651A
Expired / Lapsed
US
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Inflatable seals
Assignee: Dunlop Ltd
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Filing: 1972-12-20
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Granted: 1974-01-29
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Expires: 1992-12-20
Abstract
Abstract An inflatable seal comprising a flexible wall portion and an inflatable chamber defined at least in part by the flexible wall portion, the flexible wall portion being formed from a synthetic rubber reinforced by one or more layers of fabric reinforcement formed from an aromatic polyamide, an aromatic polyimide, or an aromatic polyamide-imide. The seals made according to the present invention are particularly suited for application in which they are exposed to extreme conditions, for example steam at high pressure. Such applications includes autoclaves, and sterilising units, of which the following is a Specification.
Inventors
- 👤 W Brown
- 👤 R Thomson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:19
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/46; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
52 words
An inflatable seal comprising a flexible wall portion and an inflatable chamber defined at least in part by the flexible wall portion, the flexible wall portion being formed from a synthetic reinforced by one or more layers of fabric reinforcement formed from an aromatic polyamide, an aromatic polyimide, or an aromatic polyamide-imide.
Claim 2
Dependent Claim
52 words
An inflatable seal comprising a flexible wall portion and an inflatable chamber defined at least in part by the flexible wall portion, the flexible wall portion being formed from a synthetic reinforced by one or more layers of fabric reinforcement formed from an aromatic polyamide, an aromatic polyimide, or an aromatic polyamide-imide.
Claim 3
Dependent Claim
26 words
An inflatable seal according to claim 1 in which the aromatic polyamide is of the general formula: (-R1CONH R2NHCO-)n where R1 and/or R2 represent aromatic groups.
Claim 4
Dependent Claim
26 words
An inflatable seal according to claim 1 in which the aromatic polyimide is of the general formula: (-R3(CO)2N R4N(CO)2-)n where R3 and/or R4 represent aromatic groups.
Claim 5
Dependent Claim
26 words
An inflatable seal according to claim 1 in which the aromatic polyamide-imide is of the general formula: (-R5(CO)2N R6NHCO-)n where R5 and/or R6 represent aromatic groups.
Claim 6
Dependent Claim
23 words
An inflatable seal according to claim 1 in which the flexible wall portion is made at least in part of a silicone rubber.
Claim 7
Dependent Claim
26 words
An inflatable Seal according to claim 5 in which at least the exterior surface of the portion of the flexible wall is formed from silicone rubber.
Claim 8
Dependent Claim
17 words
An inflatable seal according to claim 5 in which the silicone rubber is based on methyl-vinyl polysiloxane.
Claim 9
Dependent Claim
21 words
An inflatable seal according to claim 5 in which the silicone rubber is a no post cure grade of methyl-vinyl polysiloxane.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |