US4780575A
Expired / Lapsed
US
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Electrically conductive elastomer composition
Assignee: Individual
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Filing: 1987-05-14
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Granted: 1988-10-25
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Expires: 2007-05-14
Abstract
Abstract A rubber composition containing nickel fibers. The composition is electrically conductive and is useful for dissipating electromagnetic interference.
Inventors
- 👤 John W. Flavin
- 👤 John E. White
- 👤 Leslie J. Reading
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:06
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; H01; H01B; H01B1/00; H01B1/20; H01B1/22; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/249933; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
An electrically conductive composition comprising an elastomer matrix containing about 10 to 25 weight percent nickel fibers having an average length from about 0.5 to 5.0 cm and an average diameter between about 10 to 50 micron, said composition having a durometer hardness between about 20 and 55 and a tensile strength of not less than 500 psi.
Claim 2
Dependent Claim
58 words
An electrically conductive composition comprising an elastomer matrix containing about 10 to 25 weight percent nickel fibers having an average length from about 0.5 to 5.0 cm and an average diameter between about 10 to 50 micron, said composition having a durometer hardness between about 20 and 55 and a tensile strength of not less than 500 psi.
Claim 3
Dependent Claim
14 words
The composition of claim 1 wherein said fibers are randomly dispersed throughout said rubber.
Claim 4
Dependent Claim
17 words
The composition of claim 1 wherein said fibers have a electrical resistivity between about 40-80 ohms-cir. mil/ft.
Claim 5
Dependent Claim
23 words
The composition of claim 1 wherein said fibers have an EI factor that ranges between 3.5×10 -8 and 2.2×10 -5 lb.-in. 2 .
Claim 6
Dependent Claim
21 words
The composition of claim 4 wherein an effective number of ends of said fibers extend beyond the surface of said matrix.
Claim 7
Dependent Claim
60 words
A gasket comprising a rubber matrix containing about 10 to 25 weight percent randomly dispersed nickel fibers having an average length from about 0.5 to 5.0 cm, said fibers having an EI factor that ranges between 3.5×10 -8 and 2.2×10 -5 lb.-in. 2 forming electrical pathways through said matrix and beyond the gasket surface to a corresponding adjacent mechanical surface.
Claim 8
Dependent Claim
60 words
A gasket comprising a rubber matrix containing about 10 to 25 weight percent randomly dispersed nickel fibers having an average length from about 0.5 to 5.0 cm, said fibers having an EI factor that ranges between 3.5×10 -8 and 2.2×10 -5 lb.-in. 2 forming electrical pathways through said matrix and beyond the gasket surface to a corresponding adjacent mechanical surface.
Claim 9
Dependent Claim
17 words
The gasket of claim 6 wherein said fibers have an aspect ratio of about 300 to 2200.
Claim 10
Dependent Claim
17 words
The gasket of claim 7 wherein said fibers have an electrical resistivity between about 40-80 ohms-cir. mil/ft.
Claim 11
Dependent Claim
11 words
The gasket of claim 7 wherein said fibers are randomly bent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |