US4317575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature gasket
Assignee: GAF Corp
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Filing: 1980-06-16
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Granted: 1982-03-02
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Expires: 2000-06-16
Abstract
Abstract An asbestos-free gasket is produced from a composition which comprises from about 5% to about 20% of an organic latex binder, from about 5% to about 35% of a cellulosic fibrous material, from about 0% to about 30% of mineral wool, at least about 50% of an inorganic filler, and from about 0 to about 5% of a coloring additive. The percentages being on a dry weight basis of the gasket. The organic materials are present in an amount no greater than 40% of the total dry weight of the gasket and preferably no greater than 30%. The inorganic filler is an inactive additive, stable at a temperature greater than 1700° F., such as Portland Cement, diatomaceous earth, silicates, carbonates, barytes and mixtures thereof. Preferably the inorganic filler is a mixture of barytes and talc in a ratio of from about 1 to 0, to 3 to 1.
Inventors
- 👤 Ernest A. Cavicchio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:56
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/102; C; C04; C04B; C04B24/00; C04B24/24; C04B24/26; C04B24/2652; C04B26/00; C04B26/02; C04B26/04; C04B28/00; C04B28/02; C04B28/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
71 words
A high temperature, asbestos-free gasket comprising: a. from about 5% to about 20% of an organic latex binder; b. from about 5% to about 35% of cellulosic fibrous material; c. from about 0% to about 30% of mineral wool; d. at least about 50% of an inorganic filler; and e. from about 0 to about 5% of a coloring additive, said percentages being on a dry weight basis of the gasket.
Claim 2
Dependent Claim
71 words
A high temperature, asbestos-free gasket comprising: a. from about 5% to about 20% of an organic latex binder; b. from about 5% to about 35% of cellulosic fibrous material; c. from about 0% to about 30% of mineral wool; d. at least about 50% of an inorganic filler; and e. from about 0 to about 5% of a coloring additive, said percentages being on a dry weight basis of the gasket.
Claim 3
Dependent Claim
32 words
The high temperature gasket of claim 1, wherein said organic binder is a member selected from the group consisting of styrene-butadiene copolymers, polychloroprene, acrylonitrile-butadiene copolymers, ethylene-propylene-diene copolymers, isobutylene-isoprene copolymers and mixtures thereof.
Claim 4
Dependent Claim
15 words
The high temperature gasket of claim 2, wherein said organic binder is an acrylonitrile-butadiene-styrene copolymer.
Claim 5
Dependent Claim
27 words
The high temperature gasket of claim 1, wherein organic materials are present in an amount no greater than 40% of the total dry weight of the gasket.
Claim 6
Dependent Claim
26 words
The high temperature of claim 1, wherein organic materials are present in an amount no greater than 30% of the total dry weight of the gasket.
Claim 7
Dependent Claim
38 words
The high temperature gasket of claim 1, wherein said inorganic filler is an inactive additive, stable at a temperature greater than 1700° F., selected from the group consisting of talc, diatomaceous earth, silicates, carbonates, barytes and mixtures thereof.
Claim 8
Dependent Claim
28 words
The high temperature gasket of claim 1, wherein said inorganic filler comprises barytes and talc in a ratio of from about 1 to 0, to 3 to 1.
Claim 9
Dependent Claim
23 words
The high temperature gasket of claim 1, wherein said binder comprises from about 15 to 20% of an acrylonitrile-butadiene-styrene copolymer and curing agents.
Claim 10
Dependent Claim
38 words
The high temperature gasket of claim 1, wherein said coloring additives consist of from about 2 to about 5% of a material selected from the group consisting of red iron pigment, carbon black, zinc oxide, and mixtures thereof.
Claim 11
Dependent Claim
14 words
The high temperature gasket of claim 1, wherein said inorganic filler comprises Portland Cement.
Claim 12
Dependent Claim
90 words
A composition for forming on paper making equipment, a high temperature, asbestos-free gasket comprising: (a) from about 5% to about 20% of an organic latex binder; (b) from about 5% to about 35% of a cellulosic fibrous material; (c) from about 0% to about 30% of mineral wool; (d) at least about 50% of an inorganic filler; (e) from about 0 to about 3% of an agglomerant; and (f) from about 0 to about 5% of a coloring additive said percentages being on a dry weight basis of the gasket.
Claim 13
Dependent Claim
90 words
A composition for forming on paper making equipment, a high temperature, asbestos-free gasket comprising: (a) from about 5% to about 20% of an organic latex binder; (b) from about 5% to about 35% of a cellulosic fibrous material; (c) from about 0% to about 30% of mineral wool; (d) at least about 50% of an inorganic filler; (e) from about 0 to about 3% of an agglomerant; and (f) from about 0 to about 5% of a coloring additive said percentages being on a dry weight basis of the gasket.
Claim 14
Dependent Claim
30 words
The composition of claim 11, wherein said organic binder is a member selected from the group consisting of styrene-butadiene copolymers, polychloroprene, acrylonitrile-butadiene copolymers, ethylene-propylene-diene copolymers, isobutylene-isoprene copolymers, and mixtures thereof.
Claim 15
Dependent Claim
13 words
The composition of claim 12, wherein said organic binder is an acrylonitrile-butadiene-styrene copolymer.
Claim 16
Dependent Claim
25 words
The composition of claim 11, wherein organic materials are present in an amount no greater than 40% of the total dry weight of the gasket.
Claim 17
Dependent Claim
25 words
The composition of claim 11, wherein organic materials are present in an amount no greater than 30% of the total dry weight of the gasket.
Claim 18
Dependent Claim
36 words
The composition of claim 11, wherein said inorganic filler is an inactive additive, stable at a temperature greater than 1700° F., selected from the group consisting of talc, diatomaceous earth, silicates, carbonates, barytes and mixtures thereof.
Claim 19
Dependent Claim
26 words
The composition of claim 11, wherein said inorganic filler comprises barytes and talc in a ratio of from about 1 to 0, to 3 and 1.
Claim 20
Dependent Claim
21 words
The composition of claim 11, wherein said binder comprises from about 15 to 20% of an acrylonitrile-butadiene-styrene copolymer and curing agents.
Claim 21
Dependent Claim
36 words
The composition of claim 11, wherein said coloring additives consist of from about 2 to about 5% of a material selected from the group consisting of red iron pigment, carbon black, zinc oxide, and mixtures thereof.
Claim 22
Dependent Claim
12 words
The composition of claim 11, wherein said inorganic filler comprises Portland Cement.
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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) | 1985-03-01 | 1985-08-31 | 1986-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-01 | 1989-08-31 | 1990-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-01 | 1993-08-31 | 1994-03-02 | $7700.00 | Window Closed / Lapsed |