Patent US5286568A successfully refreshed from Google Patents.
US5286568A
Expired / Lapsed
US
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Electrically conductive gasket materials
Assignee: W.L. Gore and Associates Inc
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Filing: 1992-09-30
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Granted: 1994-02-15
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Expires: 2012-09-30
Abstract
Abstract This invention provides porous electrically-conductive gasket materials having thin porous coating layers that provide good release properties from clamping surfaces and that provide good electrical conductivity.
Inventors
- 👤 John E. Bacino
- 👤 James R. Hanrahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:27
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; H01B1/22; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A gasket comprising: a) a substrate layer of porous expanded polytetrafluoroethylene having electrically conductive particles therein, b) a coating on said substrate comprising a copolymer of tetrafluoroethylene and a fluorinated comonomer having electrically-conductive particles therein; wherein the gasket is electrically conductive; and wherein the gasket resists adhesion to surfaces between which it is compressed.
Claim 2
Dependent Claim
54 words
A gasket comprising: a) a substrate layer of porous expanded polytetrafluoroethylene having electrically conductive particles therein, b) a coating on said substrate comprising a copolymer of tetrafluoroethylene and a fluorinated comonomer having electrically-conductive particles therein; wherein the gasket is electrically conductive; and wherein the gasket resists adhesion to surfaces between which it is compressed.
Claim 3
Dependent Claim
21 words
The gasket of claim 1 wherein the copolymer is selected from the class consisting of tetrafluoroethylene/hexafluoropropylene and tetrafluoroethylene/perfluoro (propyl vinyl ether).
Claim 4
Dependent Claim
21 words
The gasket of claims 1 or 2 wherein the conductive particles are selected from the class consisting of carbon and metals.
Claim 5
Dependent Claim
15 words
The gasket of claim 3 wherein the conductive particles of the coating are acetylene black.
Claim 6
Dependent Claim
17 words
The gasket of claim 1 wherein the gasket's electrical resistance is low and remains low over time.
Claim 7
Dependent Claim
71 words
A gasket attached between sealing surfaces which comprises: a substrate of porous polytetrafluoroethylene (PTFE) including electrically conductive particles therein; a coating of fluorinated thermoplastic copolymer including electrically conductive particles therein, the coating being applied to the substrate; wherein the gasket is conductive of electrical charges between the sealing surfaces, such conductivity remaining essentially constant over time; and wherein the coating on the gasket serves to resist adhesion to the sealing surfaces.
Claim 8
Dependent Claim
71 words
A gasket attached between sealing surfaces which comprises: a substrate of porous polytetrafluoroethylene (PTFE) including electrically conductive particles therein; a coating of fluorinated thermoplastic copolymer including electrically conductive particles therein, the coating being applied to the substrate; wherein the gasket is conductive of electrical charges between the sealing surfaces, such conductivity remaining essentially constant over time; and wherein the coating on the gasket serves to resist adhesion to the sealing surfaces.
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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) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |