Patent US3970322A successfully refreshed from Google Patents.
US3970322A
Expired / Lapsed
US
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Cylinder head gasket for internal-combustion engine
Assignee: Goetze GmbH
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Filing: 1974-01-31
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Granted: 1976-07-20
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Expires: 1994-01-31
Abstract
Abstract A cylinder head gasket for internal combustion engines comprises at least one layer of a soft material having pores which are enriched with an impregnating agent and edges which are bordered by a casing. The pores of the soft material underneath the flange are kept free of impregnating agent.
Inventors
- 👤 Friedhelm Stecher
- 👤 Josef Fazekas
- 👤 Paul Johren
- 👤 Martin Morsbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:39
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/12; F16J15/121; F16J15/122
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
Cylinder head gasket for internal-combustion engines comprising at least one fiber layer of a soft material having pores which are enriched with an impregnating agent to increase the cross-sectional density of the soft material and edges which are bordered by a casing wherein the fiber layer is impregnated only outside of the region of the casing so that the pores of said fiber layer underneath said casing are free of impregnating agent and the fiber layer underneath said casing is more compressible than the remainder of the fiber layer.
Claim 2
Dependent Claim
89 words
Cylinder head gasket for internal-combustion engines comprising at least one fiber layer of a soft material having pores which are enriched with an impregnating agent to increase the cross-sectional density of the soft material and edges which are bordered by a casing wherein the fiber layer is impregnated only outside of the region of the casing so that the pores of said fiber layer underneath said casing are free of impregnating agent and the fiber layer underneath said casing is more compressible than the remainder of the fiber layer.
Claim 3
Dependent Claim
21 words
The gasket as defined in claim 1 wherein the soft material is reinforced with a metal insert embedded in its interior.
Claim 4
Dependent Claim
33 words
The gasket as defined in claim 1 wherein the impregnating agent is produced from a liquid which consists essentially of an organic, synthetic, completely polymerizable liquid that does not contain any volatile agents.
Claim 5
Dependent Claim
32 words
The gasket as defined in claim 1 wherein the gasket has a passage for a combustion chamber and the casing has a U-shaped cross section to protect the edges of said passage.
Claim 6
Dependent Claim
35 words
The gasket as defined in claim 4 wherein the arms of the U lie on opposing planar surfaces of the gasket and the base of the U lies against the interior surface of said passage.
References Cited (Backward Citations)
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Cited
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US2245122A
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US2289620A
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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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |