Patent US4973516A successfully refreshed from Google Patents.
US4973516A
Expired / Lapsed
US
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Gaskets for use in internal combustion engines
Assignee: Nippon Carbon Co Ltd
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Filing: 1988-07-28
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Granted: 1990-11-27
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Expires: 2008-07-28
Abstract
Abstract A gasket for use in internal combustion engines characterized in that one or both surfaces of a metallic or non-metallic sheet thereof are coated with a coat layer of a thickness of from 10 to 300 μm composed of a coating material comprising from 20 to 60% by weight of expanded graphite having a specific volume of from 10 to 300 cc/g and from 40 to 80% by weight of a binder such as a synthetic resin.
Inventors
- 👤 Hidenori Yamaoka
- 👤 Yoshinao Kobayashi
- 👤 Kuri Suga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:37
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/08; F16J15/10; F16J15/12; F16J15/121; F16J15/122; C; C09; C09K; C09K3/00; C09K3/10; F02; F02F; F02F11/00; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/26; Y10T428/269; Y10T428/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A gasket for use in internal combustion engines which comprises a metallic or non-metallic sheet having formed on one or both surfaces thereof a coat layer of a thickness of from 10 to 300 μm composed of a coating material comprising from 20 to 60% by weight of expanded graphite having a specific volume of from 10 to 300 cc/g and from 40 to 80% by weight of a binder.
Claim 2
Dependent Claim
70 words
A gasket for use in internal combustion engines which comprises a metallic or non-metallic sheet having formed on one or both surfaces thereof a coat layer of a thickness of from 10 to 300 μm composed of a coating material comprising from 20 to 60% by weight of expanded graphite having a specific volume of from 10 to 300 cc/g and from 40 to 80% by weight of a binder.
Claim 3
Dependent Claim
20 words
The gasket for use in internal combustion engines in accordance with claim 1 wherein said binder is a synthetic resin.
Claim 4
Dependent Claim
31 words
The gasket for use in internal combustion engines in accordance with claim 2 wherein said synthetic resin is selected from phenolic resins, epoxy resins, acrylic resins, silicone resins and fluorine resins.
Claim 5
Dependent Claim
20 words
The gasket for use in internal combustion engines in accordance with claim 1 wherein said binder is a fluorine rubber.
Claim 6
Dependent Claim
33 words
The gasket for use in internal combustion engines in accordance with claim 1 wherein said metallic sheet is composed of iron, copper, a copper alloy, aluminum, an aluminum alloy or a stainless steel.
Claim 7
Dependent Claim
36 words
The gasket for use in internal combustion engines in accordance with claim 1 wherein said non-metallic sheet is composed of asbestos, ceramics, paper, aramid fibers, a synthetic resin, graphite or rubber, or a composite material thereof.
Claim 8
Dependent Claim
43 words
The gasket for use in internal combustion engines in accordance with claim 1 wherein said coat layer is formed by applying said coating material to said metallic or non-metallic sheet by coating, printing dipping or spraying, followed by curing the applied coating material.
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) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-26 | 2002-05-28 | 2002-11-27 | $7700.00 | Window Closed / Lapsed |