US4333975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat gasket laminate of expanded graphite foil and metallic reinforcement layer
Assignee: DAN LOC INVESTMENTS Inc
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Filing: 1980-12-05
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Granted: 1982-06-08
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Expires: 2000-12-05
Abstract
Abstract A flat gasket comprises a laminate of layers of expanded graphite foil and a metallic reinforcement layer, the graphite foil layers being so disposed as to overlap with and enclose the reinforcement layer within the gasket in relation to at least one edge thereof, said one edge being that edge of the gasket which in use may be exposed to an aggressive environment. Such an aggressive environment may be inside and/or outside the parts joined by the gasket. The reinforcement layer may project beyond the graphite foil layers at the opposite edge to said one edge, the projecting portion constituting locating means for the gasket in use or during installation.
Inventors
- 👤 Geoffrey Booth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:24
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/16; F16L23/18; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/12; F16J15/121; Y; Y10; Y10T; Y10T428/00; Y10T428/21; Y10T428/215; Y10T428/24; Y10T428/24777; Y10T428/29; Y10T428/2982; Y10T428/30; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
A flat gasket consisting essentially of a laminate of layers of expanded graphite foil and a metallic reinforcement layer, the graphite foil layers being so disposed as to overlap with and enclose the reinforcement layer within the gasket in relation to at least one edge thereof, said one edge being that edge of the gasket which in use is exposed to an aggressive environment.
Claim 2
Dependent Claim
64 words
A flat gasket consisting essentially of a laminate of layers of expanded graphite foil and a metallic reinforcement layer, the graphite foil layers being so disposed as to overlap with and enclose the reinforcement layer within the gasket in relation to at least one edge thereof, said one edge being that edge of the gasket which in use is exposed to an aggressive environment.
Claim 3
Dependent Claim
37 words
The gasket of claim 1 wherein the metallic reinforcement layer projects beyond the graphite foil layers at the opposite edge to said one edge and the projecting portion thereof constitutes locating means for the gasket on installation.
Claim 4
Dependent Claim
15 words
The flat gasket of claim 1 or 2 having at least one joint lengthwise thereof.
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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |