Patent US4477094A successfully refreshed from Google Patents.
US4477094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasket and method for high-temperature and high pressure application
Assignee: Nichias Corp
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Filing: 1981-05-06
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Granted: 1984-10-16
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Expires: 2001-05-06
Abstract
Abstract A gasket including a sheet having a composition of 40 to 80% by weight of thin flakes of expanded vermiculite, 1 to 30% by weight of fibers, 5 to 40% by weight of fine filling grains, and appropriate amounts of a binding agent and a vulcanizing agent. The sheet also has a metal plate laminated thereto. A vortex gasket may be formed by spirally winding a metal hoop together with a filling material, which is composed primarily of expanded vermiculite.
Inventors
- 👤 Tsutomu Yamamoto
- 👤 Masaaki Ashizawa
- 👤 Kazuo Nishimoto
- 👤 Yuji Sekiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:53
CPC Classifications
B; B32; B32B; B32B19/00; B32B19/04; B32B19/041; F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/12; F16J15/121; F16J15/122; B32B2307/00; B32B2307/70; B32B2307/718; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2581/00; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/25; Y10T442/00; Y10T442/60; Y10T442/654; Y10T442/656
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A gasket comprising: a sheet having a composition of 40 to 80% by weight of thin flakes of expanded vermiculite, 1 to 30% by weight of fibers, 5 to 40% by weight of fine filling grains, and appropriate amounts of a binding agent and a vulcanizing agent; and a metal plate laminated to said sheet.
Claim 2
Dependent Claim
55 words
A gasket comprising: a sheet having a composition of 40 to 80% by weight of thin flakes of expanded vermiculite, 1 to 30% by weight of fibers, 5 to 40% by weight of fine filling grains, and appropriate amounts of a binding agent and a vulcanizing agent; and a metal plate laminated to said sheet.
Claim 3
Dependent Claim
19 words
A gasket as recited in claim 1, in which said metal plate is provided with a plurality of projections.
Claim 4
Dependent Claim
22 words
A gasket as recited in claim 1, in which the amount of said fine grains ranges from 19 to 30% by weight.
Claim 5
Dependent Claim
29 words
A gasket as recited in claim 1, in which said fibers comprise at least one of the group consisting of pulp, stainless steel fibers, glass fibers, and ceramic fibers.
Claim 6
Dependent Claim
22 words
A gasket as recited in claim 1, in which said thin flakes of vermiculite have a diameter of 10 to 60 meshes.
Claim 7
Dependent Claim
23 words
A gasket as recited in claim 1, in which said thin flakes of vermiculite have a thickness of no more than 100 microns.
References Cited (Backward Citations)
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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) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |