US3650827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fep cables
Assignee: SEIP Ltd 551 MADISON AVENUE NEW YORK NY 10022 A CORP OF
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Filing: 1969-11-17
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Granted: 1972-03-21
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Expires: 1989-11-17
Abstract
Abstract Electric cables of the type known as composite electrical insulated cables are insulated with a first inner layer of insulation material such as polyolefin and second outer layer of an irradiated cross-linked co-polymer of tetrafluoroethylene and hexafluoropropylene known in the trade as FEP to form a superior high temperature cable.
Inventors
- 👤 Chester A Brown
- 👤 Louis F Rossetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:05
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/20; B05D3/00; B05D3/06; B05D7/50; B05D7/52; B05D7/54; B05D7/546; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; H01B3/443; H01B3/445; H01B7/00; H01B7/17; H01B7/28; B05D5/00; B05D5/08; B05D5/083; Y; Y02; Y02A; Y02A30/00; Y02A30/14; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A structural article comprising a first layer consisting a polyolefin and a second layer consisting of a co-polymer of tetrafluoroethylene and hexafluoropropylene, each of said layers being irradiated and thereby crOss-linked throughout and each of said layers being irradiated and thereby cross-linked at least to an extent that when heated above its respective crystalline melting temperature it has form stability.
Claim 2
Dependent Claim
14 words
The structural article of claim 2 wherein said polyolefin is polyethylene or its copolymers.
Claim 3
Dependent Claim
60 words
An electric cable comprising at least one conductor, a plurality of layers of insulation surrounding said conductor, one of said layers comprising an extruded cross-linked polyolefin intimately in contact with said electric conductor and a sheath surrounding said cross-linked polyolefin material and in intimate contact with said cross-linked polyolefin, said sheath comprising an irradiated cross-linked co-polymer of tetrafluoroethylene and hexafluoropropylene.
Claim 4
Independent Claim
78 words
The method of forming an electrically insulated current carrying body comprising selecting electrical current carrying bodies whose lengths are substantially greater than their widths, forming a polyolefin layer over substantially the entire length of one of said electrical current carrying bodies, irradiating and thereby cross-linking said cross-linked polyolefin, coating said polyolefin layer with a co-polymer of tetrafluoroethylene and hexafluoropropylene and, irradiating and thereby cross-linking said co-polymer, said cross-linking being accomplished above the glass transition temperature of the co-polymer.
Claim 5
Dependent Claim
17 words
The method of claim 5 wherein said irradiation comprises high energy electrons sufficient to penetrate said co-polymer.
Claim 6
Dependent Claim
20 words
The method of claim 6 wherein the irradiation is accomplished at temperatures above the internal friction temperature of the co-polymer.
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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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |