US4373735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soft material sealing disc used as head gasket
Assignee: Goetze GmbH
•
Filing: 1979-09-17
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Granted: 1983-02-15
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Expires: 1999-09-17
Abstract
Abstract A porous soft material sealing gasket comprising an asbestos fiber web with a multiplicity of perforations. The perforated web is impregnated with an impregnating agent that at least partially fills the free pores of the web by penetrating through the perforations.
Inventors
- 👤 Martin Morsbach
- 👤 Friedhelm Stecher
- 👤 Eberhard Stocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:39
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/12; F16J15/121; F16J15/122
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
65 words
A porous soft material sealing gasket, comprising a soft material in the form of an asbestos fiber web having a sealing face and an impregnating agent, said asbestos fiber web containing free pores and a multiplicity of perforations in its unimpregnated form, and said impregnating agent filling at least a part of the free pores of the web by penetrating through the perforations during impregnation.
Claim 2
Dependent Claim
65 words
A porous soft material sealing gasket, comprising a soft material in the form of an asbestos fiber web having a sealing face and an impregnating agent, said asbestos fiber web containing free pores and a multiplicity of perforations in its unimpregnated form, and said impregnating agent filling at least a part of the free pores of the web by penetrating through the perforations during impregnation.
Claim 3
Dependent Claim
12 words
The gasket of claim 1 wherein the fiber web is metallically reinforced.
Claim 4
Dependent Claim
17 words
The gasket of claim 2 wherein the gasket is a cylinder head gasket for internal combustion engines.
Claim 5
Dependent Claim
24 words
The gasket of claim 1 wherein the perforations pass through the fiber web in a direction perpendicular to the sealing face of the web.
Claim 6
Dependent Claim
20 words
The gasket of claim 1 wherein the perforations are distributed over the surface of the sealing faces at uniform intervals.
Claim 7
Dependent Claim
45 words
The gasket of claim 1, 2, 3, 4, or 5, wherein the gasket contains two webs, each of which has a sealing face and a multiplicity of perforations, and approximately 3 to 15 perforations per square centimeter of sealing face are provided on each web.
Claim 8
Dependent Claim
43 words
The gasket of claim 1, 2, 3, 4, or 5, wherein the gasket has two sides, each of which has a sealing face, and approximately 3 to 15 perforations per square centimeter of sealing face are provided on each side of the gasket.
Claim 9
Dependent Claim
38 words
The gasket of claim 1, 2, 3, 4, or 5, wherein the perforation density per unit area of the web, is a function of the thickness of the web, said density increasing with increasing thickness of the web.
Claim 10
Dependent Claim
22 words
The gasket of claim 2 or 3 wherein the perforations are applied after the web has been reinforced with a metal plate.
Claim 11
Dependent Claim
24 words
The gasket of claim 1, 2, 3, 4, or 5, wherein the perforations each have a diameter of about 0.01 to about 0.1 mm.
Claim 12
Dependent Claim
13 words
The gasket of claim 1 wherein the impregnating agent is a plastic material.
Claim 13
Dependent Claim
18 words
The gasket of claim 1 wherein the impregnating agent is a material which is elastically cross-linked after impregnation.
Claim 14
Dependent Claim
35 words
The gasket of claim 1, 2, 3, 4 or 5, wherein, during said impregnation, the impregnating agent is in the form of an organic, synthetic, completely polymerizable liquid, which does not contain any volatile material.
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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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |