Patent NL36202C successfully refreshed from Google Patents.
Patent US4485138A successfully refreshed from Google Patents.
US4485138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-resistant sheet gasket
Assignee: Nichias Corp
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Filing: 1982-09-30
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Granted: 1984-11-27
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Expires: 2002-09-30
Abstract
Abstract A milled blend is prepared, which comprises extremely short fibers and rubber as well as a suitable amount of long fibers having hair root-like branches or a number of whiskers and/or bent long fibers and, optionally, a suitable amount of fillers. The milled blend is then laminated under pressure on both sides of a hooked, corrugated or embossed thin metal sheet, and vulcanized in a suitable manner. The resulting sheet gasket excels in sealing properties, heat resistance and durability.
Inventors
- 👤 Tsutomu Yamamoto
- 👤 Masaaki Ashizawa
- 👤 Yutaka Shimoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:28
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/12; F16J15/121; F16J15/122; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24339; Y10T428/24347; Y10T428/24479; Y10T428/24595; Y10T428/24603; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/25; Y10T428/252; Y10T428/31504; Y10T428/31652; Y10T428/31656; Y10T428/31678; Y10T442/00; Y10T442/60; Y10T442/654; Y10T442/656
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
78 words
A heat-resistant sheet gasket obtained by preparing a milled blend comprising extremely short fibers of wollastonite needle crystals of C a SiO 3 , natural or synthetic rubber together with an amount of fibrillated polymeric long fibers having hair root-like branches, an amount of clay fillers and thermally conductive fine particles of carbon, aluminum, copper, a copper alloy, stainless steel, steel, and laminating the blend under pressure on both sides of a thin metal sheet followed by vulcanization.
Claim 2
Dependent Claim
78 words
A heat-resistant sheet gasket obtained by preparing a milled blend comprising extremely short fibers of wollastonite needle crystals of C a SiO 3 , natural or synthetic rubber together with an amount of fibrillated polymeric long fibers having hair root-like branches, an amount of clay fillers and thermally conductive fine particles of carbon, aluminum, copper, a copper alloy, stainless steel, steel, and laminating the blend under pressure on both sides of a thin metal sheet followed by vulcanization.
Claim 3
Dependent Claim
17 words
A heat-resistant sheet gasket according to claim 1, wherein the fibrillated polymeric fibers are aromatic polyamide fibers.
Claim 4
Dependent Claim
16 words
A heat-resistant sheet gasket according to claim 1, wherein the fibrillated polymeric fibers are acryl fibers.
Claim 5
Dependent Claim
16 words
A heat-resistant sheet gasket according to claim 1, wherein said milled blend further includes cellulose fibers.
Claim 6
Dependent Claim
72 words
A heat-resistant sheet gasket obtained by preparing a milled blend consisting of 50 to 70% by weight of extremely short fibers, 10 to 20% by weight of natural or synthetic rubber and 10 to 20% by weight of at least one fiber member selected from the group consisting of fibrillated polymeric fibers and cellulosic fibers, and laminating the blend under pressure onto both sides of a thin metal sheet, followed by vulcanization.
Claim 7
Dependent Claim
72 words
A heat-resistant sheet gasket obtained by preparing a milled blend consisting of 50 to 70% by weight of extremely short fibers, 10 to 20% by weight of natural or synthetic rubber and 10 to 20% by weight of at least one fiber member selected from the group consisting of fibrillated polymeric fibers and cellulosic fibers, and laminating the blend under pressure onto both sides of a thin metal sheet, followed by vulcanization.
Claim 8
Dependent Claim
14 words
The sheet gasket according to claim 5, wherein said fiber member is cellulosic fibers.
Claim 9
Dependent Claim
14 words
The sheet gasket according to claim 5, wherein the extremely short fibers are wollastonite.
Claim 10
Dependent Claim
14 words
The sheet gasket according to claim 6, wherein the extremely short fibers are wollastonite.
Claim 11
Dependent Claim
25 words
The sheet gasket according to claim 5, wherein the fibrillated polymeric fibers are selected from the group consisting of aromatic polyamide, acrylic and polyethylene fibers.
Claim 12
Dependent Claim
30 words
The sheet gasket according to claim 5, and further including 10 to 20% by weight of finely particulate filler and 5 to 10% by weight of thermally conductive fine particles.
Claim 13
Dependent Claim
30 words
The sheet gasket according to claim 6, and further including 10 to 20% by weight of finely particulate filler and 5 to 10% by weight of thermally conductive fine particles.
Claim 14
Dependent Claim
28 words
The sheet gasket according to claim 10, wherein the filler is clay, and the fine particles are those of carbon, aluminum, copper, copper alloys, stainless steel and steel.
Claim 15
Dependent Claim
15 words
The sheet gasket according to claim 5 wherein said fiber member is fibrillated polymeric fibers.
Claim 16
Dependent Claim
17 words
The sheet gasket according to claim 5, wherein said fiber member is cellulosic fiber and fibrillated fibers.
Claim 17
Dependent Claim
72 words
A heat-resistant sheet gasket obtained by preparing a milled blend comprising extremely short fibers of wollastonite needle crystals of C a SiO 3 , natural or synthetic rubber together with an amount of cellulous fibers, an amount of clay fillers and thermally conductive fine particles of carbon, aluminum, copper, a copper alloy, stainless steel, steel, and laminating the blend under pressure on both sides of a thin metal sheet followed by vulcanization.
Claim 18
Dependent Claim
72 words
A heat-resistant sheet gasket obtained by preparing a milled blend comprising extremely short fibers of wollastonite needle crystals of C a SiO 3 , natural or synthetic rubber together with an amount of cellulous fibers, an amount of clay fillers and thermally conductive fine particles of carbon, aluminum, copper, a copper alloy, stainless steel, steel, and laminating the blend under pressure on both sides of a thin metal sheet followed by vulcanization.
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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |