US4546033A
Expired / Lapsed
US
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Gasket sheet
Assignee: Nichias Corp
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Filing: 1984-01-25
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Granted: 1985-10-08
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Expires: 2004-01-25
Abstract
Abstract A gasket sheet obtained by the milling and vulcanization of 50-85% by weight of a fibrous material, 10-50% by weight of a rubber material and at least 1-23% by weight of a water-insoluble and -swelling substance. The gasket sheet may be a one layer or a three layer sheet.
Inventors
- 👤 Yasushi Tsuchimoto
- 👤 Shiro Takahata
- 👤 Kiyotaka Shimada
- 👤 Koji Tanaka
- 👤 Susumu Aoki
- 👤 Tsutomu Yamamoto
- 👤 Masaaki Ashizawa
- 👤 Kazuo Nishimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:01
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C09K3/1025; C09K3/1028; C09K2003/1034; C09K2003/104; C09K2003/1081; C09K2200/00; C09K2200/02; C09K2200/0278; C09K2200/0282; C09K2200/0286; C09K2200/0291; C09K2200/06; C09K2200/0607; C09K2200/0615; C09K2200/063; C09K2200/0692; C09K2200/0697; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31659; Y10T442/00; Y10T442/20; Y10T442/2041; Y10T442/2049; Y10T442/2762; Y10T442/277; Y10T442/282; Y10T442/2926; Y10T442/2992
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
134 words
A molded and vulcanized three-layer gasket sheet comprising an intermediate layer and an outer layer laminated on each side of said intermediate layer, said intermediate layer comprising 50-85% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-50% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber and 1-23% by weight of a water-insoluble and -swelling substance, and said outer layers comprising 50-85% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-50% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber and 1-38% by weight of a water-insoluble and -swelling material.
Claim 2
Dependent Claim
134 words
A molded and vulcanized three-layer gasket sheet comprising an intermediate layer and an outer layer laminated on each side of said intermediate layer, said intermediate layer comprising 50-85% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-50% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber and 1-23% by weight of a water-insoluble and -swelling substance, and said outer layers comprising 50-85% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-50% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber and 1-38% by weight of a water-insoluble and -swelling material.
Claim 3
Dependent Claim
36 words
A gasket sheet according to claim 1, in which said water-insoluble and -swelling substance is in the form selected from the group of forms consisting of fibrous, granular, and a combination of fibers and granular forms.
Claim 4
Dependent Claim
19 words
A gasket sheet according to claim 2, in which said fibrous water-swelling substance has a length of 0.1-10 mm.
Claim 5
Dependent Claim
47 words
A gasket sheet according to claim 1, in which said water-insoluble and -swelling substance is selected from the group consisting of natural high-molecular substances and synthetic high-molecular substances both of which are hydrophilic and insoluble in water and that contain an ionizable group and/or a nonionic group.
Claim 6
Dependent Claim
18 words
A gasket sheet according to claim 4, in which said ionizable group includes carboxyl, sulphonic, and amino groups.
Claim 7
Dependent Claim
87 words
A three-layer gasket sheet according to claim 1, in which said intermediate layer comprises 62% by weight of asbestos fibers, 11% by weight of SBR and natural rubber, 12% by weight of vulcanizers and fillers, and 15% by weight of an acrylic, fibrous water-insoluble and -swelling substance, and in which said outer layers comprise 62% by weight of asbestos fibers, 11% by weight of SBR and natural rubber, 12% by weight of vulcanizers and fillers, and 15% by weight of an acrylic, granular, water-insoluble and -swelling substance.
Claim 8
Dependent Claim
84 words
A three-layer gasket sheet according to claim 1, in which said intermediate layer comprises 64% by weight of asbestos fibers, 13% by weight of NBR and NR, 9.5% by weight of vulcanizers and fillers, and 13.5% by weight of acrylic, fibrous water-insoluble and -swelling substances, and in which said outer layers comprise 64% by weight of asbestos fibers, 13% by weight of NBR and NR, 13% by weight of vulcanizers and fillers, and 10% by weight of a starch-based granular water-insoluble and -swelling substance.
Claim 9
Dependent Claim
84 words
A three-layer gasket sheet according to claim 1, in which said intermediate layer comprises 62% by weight of asbestos fibers, 13% by weight of NBR and NR, 10% by weight of vulcanizers and fillers, and 15% by weight of acrylic, fibrous water-insoluble and -swelling substances, and in which said outer layers comprise 61% by weight of asbestos fibers, 13% by weight of NBR and NR, 16% by weight of vulcanizers and fillers, and 10% by weight of a starch-based granular water-insoluble and -swelling substance.
Claim 10
Dependent Claim
136 words
A molded and vulcanized three-layer gasket sheet comprising an intermediate layer and an outer layer laminated on each side of said intermediate layer, said intermediate layer comprising 50-85% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-50% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber and 1-23% by weight of a fibrous water-insoluble and -swelling substance, and said outer layers comprising 50-85% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-50% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber and 1-38% by weight of a granular, water-insoluble and -swelling material.
Claim 11
Dependent Claim
136 words
A molded and vulcanized three-layer gasket sheet comprising an intermediate layer and an outer layer laminated on each side of said intermediate layer, said intermediate layer comprising 50-85% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-50% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber and 1-23% by weight of a fibrous water-insoluble and -swelling substance, and said outer layers comprising 50-85% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-50% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber and 1-38% by weight of a granular, water-insoluble and -swelling material.
Claim 12
Dependent Claim
87 words
A three-layer gasket sheet according to claim 9, in which said intermediate layer comprises 62% by weight of asbestos fibers, 11% by weight of SBR and natural rubber, 12% by weight of vulcanizers and fillers, and 15% by weight of an acrylic, fibrous water-insoluble and -swelling substance, and in which said outer layers comprise 62% by weight of asbestos fibers, 11% by weight of SBR and natural rubber, 12% by weight of vulcanizers and fillers, and 15% by weight of an acrylic, granular, water-insoluble and -swelling substance.
Claim 13
Dependent Claim
84 words
A three-layer gasket sheet according to claim 9, in which said intermediate layer comprises 64% by weight of asbestos fibers, 13% by weight of NBR and NR, 9.5% by weight of vulcanizers and fillers, and 13.5% by weight of acrylic, fibrous water-insoluble and -swelling substances, and in which said outer layers comprise 64% by weight of asbestos fibers, 13% by weight of NBR and NR, 9.5% by weight of vulcanizers and fillers, and 10% by weight of a starch-based granular water-insoluble and -swelling substance.
Claim 14
Dependent Claim
42 words
A three-layer gasket sheet according to claim 9, wherein said fibrous water-insoluble and -swelling substance has a degree of water swelling of 30 to 50 and said granular water-insoluble and -swelling substance has a degree of water swelling of 30 to 1,000.
Claim 15
Dependent Claim
149 words
A molded and vulcanized three-layer gasket sheet comprising an intermediate layer and an outer layer laminated on each side of said intermediate layer, said intermediate layer comprising 60-66% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-15% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber, 4-28% by weight of filler or vulcanizers and 2-15% by weight of a water-insoluble and -swelling substance, and said outer layers comprising 60-66% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-15% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber, 4-28% by weight of filler or vulcanizers and 2-15% by weight of a granular, water-insoluble and -swelling material.
Claim 16
Dependent Claim
149 words
A molded and vulcanized three-layer gasket sheet comprising an intermediate layer and an outer layer laminated on each side of said intermediate layer, said intermediate layer comprising 60-66% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-15% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber, 4-28% by weight of filler or vulcanizers and 2-15% by weight of a water-insoluble and -swelling substance, and said outer layers comprising 60-66% by weight of a fibrous material selected from the group consisting of asbestos, glass, carbon, phenol and cellulose fibers, 10-15% by weight of a rubber material selected from the group consisting of styrene butadiene rubber, nitrile-butadiene rubber and natural rubber, 4-28% by weight of filler or vulcanizers and 2-15% by weight of a granular, water-insoluble and -swelling material.
References Cited (Backward Citations)
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US2381248A
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JPS4824814B1
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SU675241A1
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US4295987A
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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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |