US4764422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive composite material
Assignee: Raychem Ltd
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Filing: 1986-11-21
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Granted: 1988-08-16
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Expires: 2006-11-21
Abstract
Abstract Electrically conductive composite material comprises: (a) an open-celled cellular structure of polymeric material, preferably an open-celled foam, having electrically conductive material on at least its interior surface defining the cells, e.g. deposited metal; and (b) substantially solid, preferably non-conductive, material overlying and/or filling the cellular structure. The solid material (b) is preferably polymeric and may be formed in situ by polymerization of a monomer oligomer or may be introduced e.g. in molten form. The material is useful for electromagnetic shielding, e.g. for cable feedthrough glands or dimensionally recoverable articles.
Inventors
- 👤 Frederick W. L. Hill
- 👤 Nigel R. Bates
- 👤 Leo G. Svendsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:52
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/22; H01; H01B; H01B1/00; H01B1/20; H01B1/22; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/24996; Y10T428/249962; Y10T428/249964; Y10T428/249967; Y10T428/24997; Y10T428/249994; Y10T428/249998
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
43 words
An electrically conductive composite material comprising: (a) an open-celled cellular structure of polymeric material having electrically conductive material on at least its interior surface defining the cellular free space, and (b) substantially solid electrically non-conductive filling material substantially filling the cellular free space.
Claim 2
Dependent Claim
43 words
An electrically conductive composite material comprising: (a) an open-celled cellular structure of polymeric material having electrically conductive material on at least its interior surface defining the cellular free space, and (b) substantially solid electrically non-conductive filling material substantially filling the cellular free space.
Claim 3
Dependent Claim
25 words
A composite material according to claim 1 wherein the average cell diameter of the cellular structure is within the range form 0.01 to 10 millimeters.
Claim 4
Dependent Claim
21 words
A composite material according to claim 1, wherein the cellular free space comprises 45 to 99% of the unfilled cellular structure.
Claim 5
Dependent Claim
25 words
A composite material according to claim 1, wherein the electrically conductive material is a substantially continuous coating on the interior surface of the cellular structure.
Claim 6
Dependent Claim
16 words
A composite material according to claim 4, wherein the electrically conductive coating is a metal coating.
Claim 7
Dependent Claim
18 words
A composite material according to claim 5, wherein the metal coating has been plated on the polymeric material.
Claim 8
Dependent Claim
18 words
A composite material according to claim 1, wherein the material within the cellular free space comprises polymeric material.
Claim 9
Dependent Claim
28 words
A composite material according to claim 7, wherein the polymeric material within the cellular free space has been formed in situ by polymerisation of a monomer or oligomer.
Claim 10
Dependent Claim
26 words
A composite material according to claim 1, wherein the material within the cellular free space has been introduced thereinto in a molten state and subsequently solidified.
Claim 11
Dependent Claim
18 words
A composite material according to claim 1, wherein the material within the cellular free space comprises an elastomer.
Claim 12
Dependent Claim
20 words
A dimensionally recoverable article which is provided with an electromagnetic shield comprising a composite material as claimed in claim 1.
Claim 13
Dependent Claim
25 words
A composite material according to claim 2, wherein the average cell diameter of the cellular structure is within the range from 0.2 to 2 millimeters.
Claim 14
Dependent Claim
69 words
A cable feedthrough gland for use with at least one shielded cable, the gland comprising: (a) an electrically conductive housing; and (b) a seal formed from an electically conductive composite material as claimed in claim 1, the seal being arranged to form a seal, and an electrical connection between the housing and the shield of a cable which, when the gland is in use, would extend through the housing.
References Cited (Backward Citations)
US3707401A
Cited
US4576859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |