US4871883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-magnetic shielding
Assignee: W.L. Gore and Associates Inc
•
Filing: 1987-07-23
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Granted: 1989-10-03
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Expires: 2007-07-23
Abstract
Abstract An electro-magnetic shielding comprising at least a two-layered electro-magnetic shielding in which one layer is formed by an electrical conductor, such as a metal braiding shield, and in which second layer is formed by a flexible, electrically non-conductive plastic layer doped with non-magnetic metal particles.
Inventors
- 👤 Eric Guiol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:59
CPC Classifications
H; H01; H01B; H01B11/00; H01B11/02; H01B11/06; H01B11/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
An electro-magnetic shielded cable comprising at least one signal conductor surrounded by at least two shielding layers, wherein said first shielding layer formed by an electrical conductor in the form of a metal braid and a second shielding layer formed by a flexible, electrically non-conductive layer of polytetrafluoroethylene (PTFE) doped with non-magnetic metal particles.
Claim 2
Dependent Claim
54 words
An electro-magnetic shielded cable comprising at least one signal conductor surrounded by at least two shielding layers, wherein said first shielding layer formed by an electrical conductor in the form of a metal braid and a second shielding layer formed by a flexible, electrically non-conductive layer of polytetrafluoroethylene (PTFE) doped with non-magnetic metal particles.
Claim 3
Dependent Claim
54 words
An electro-magnetic shielded cable comprising at least one signal conductor surrounded by at least two shielding layers, wherein said first shielding layer formed by an electrical conductor in the form of a metal foil and a second shielding layer formed by a flexible, electrically non-conductive layer of polytetrafluoroethylene doped with non magnetic metal particles.
Claim 4
Dependent Claim
54 words
An electro-magnetic shielded cable comprising at least one signal conductor surrounded by at least two shielding layers, wherein said first shielding layer formed by an electrical conductor in the form of a metal foil and a second shielding layer formed by a flexible, electrically non-conductive layer of polytetrafluoroethylene doped with non magnetic metal particles.
Claim 5
Dependent Claim
18 words
An electro-magnetic shielded cable according to claim 1 wherein the layer of polytetrafluoroethylene (PTFE) is doped with copper.
Claim 6
Dependent Claim
31 words
An electro-magnetic shielded cable according to claim 1 further comprising a third outer shielding layer surrounding the second shielding layer, wherein said outer shielding layer is formed of a metal braid.
Claim 7
Dependent Claim
60 words
An electro-magnetic shielded coaxial cable comprising: a single signal conductor surrounded by a dielectric; a first shield of metal braiding surrounding said dielectric; a metal-doped electrically non-conductive intermediate plastic layer, wherein said intermediate plastic layer if PTFE doped with copper powder; a second shield of metal braiding surrounding said intermediate layer; and an outermost layer further comprising a plastic jacket.
Claim 8
Dependent Claim
60 words
An electro-magnetic shielded coaxial cable comprising: a single signal conductor surrounded by a dielectric; a first shield of metal braiding surrounding said dielectric; a metal-doped electrically non-conductive intermediate plastic layer, wherein said intermediate plastic layer if PTFE doped with copper powder; a second shield of metal braiding surrounding said intermediate layer; and an outermost layer further comprising a plastic jacket.
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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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |