US4049856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaskets
Assignee: TBA Industrial Products Ltd
•
Filing: 1976-05-24
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Granted: 1977-09-20
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Expires: 1996-05-24
Abstract
Abstract This invention relates to a metal-cored asbestos-rubber gasket wherein openings are formed in the gasket with the openings being defined by eyelets. The eyelets have flanges which engage the facing layers of the gasket and normal cracking of the eyelets incipient to incorporation thereof in the gasket is prevented by incorporating in the facing layer material microspheres in a sufficient amount to permit crushing thereof by the eyelet flanges under pressure.
Inventors
- 👤 David John Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:31
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/06; B32B3/00; B32B3/26; F; F02; F02F; F02F11/00; F02F11/002; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/12; F16J15/121; F16J15/122; F16J15/123; B32B2315/00; B32B2315/12; B32B2581/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49297; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24281; Y10T428/24298; Y10T428/24314; Y10T428/25; Y10T428/252; Y10T428/31504; Y10T428/31551; Y10T428/31641; Y10T428/31652; Y10T428/31656; Y10T428/31678; Y10T428/31692; Y10T428/31696; Y10T428/31707
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
A metal-cored gasket comprising, in combination: a metal core; a facing layer bonded to each side of said core, at least one opening through said core and said facing layer, an eyelet in said opening, said eyelet having flanges seated in said facing layers in facing layer deforming relation, each facing layer consisting essentially of asbestos, rubber and microspheres, said rubber and asbestos being present in relative amounts so as to exhibit a compression set greater than 50% in the absence of said microspheres, said microspheres being present in amount up to 75% by volume and which amount is sufficient locally to modify said facing layer to permit crushing thereof by an associated eyelet flange at a pressure to protect said eyelet from incipient cracks incident to incorporation thereof in the gasket.
Claim 2
Dependent Claim
132 words
A metal-cored gasket comprising, in combination: a metal core; a facing layer bonded to each side of said core, at least one opening through said core and said facing layer, an eyelet in said opening, said eyelet having flanges seated in said facing layers in facing layer deforming relation, each facing layer consisting essentially of asbestos, rubber and microspheres, said rubber and asbestos being present in relative amounts so as to exhibit a compression set greater than 50% in the absence of said microspheres, said microspheres being present in amount up to 75% by volume and which amount is sufficient locally to modify said facing layer to permit crushing thereof by an associated eyelet flange at a pressure to protect said eyelet from incipient cracks incident to incorporation thereof in the gasket.
Claim 3
Dependent Claim
34 words
A metal-cored gasket material according to claim 1, wherein the microspheres have a diameter of from about 20 μM to 200 μM and a wall thickness of from 5% to 15% of their diameter.
Claim 4
Dependent Claim
15 words
A metal-cored gasket material according to claim 1, wherein the microspheres are fuel ash cenospheres.
Claim 5
Dependent Claim
23 words
A metal-cored gasket according to claim 1 wherein the microspheres are coated with a bonding agent before compounding with the rubber and asbestos.
Claim 6
Dependent Claim
15 words
A metal-cored gasket material according to claim 4 wherein the bonding agent is a silane.
Claim 7
Dependent Claim
36 words
A metal-cored gasket material according to claim 1 wherein the facing layer has a rubber content in the range 15% to 30% by volume and an asbestos fibre content of from 10% to 70% by volume.
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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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |