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Patent US3674915A successfully refreshed from Google Patents.
US3674915A
Expired / Lapsed
US
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Electrical cable having an ethylene-1-olefin copolymer as the dielectric material
Assignee: Phillips Petroleum Co
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Filing: 1971-06-01
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Granted: 1972-07-04
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Expires: 1991-06-01
Abstract
Abstract An electrical cable having at least two spaced apart electrical conductors separated by a dielectric material comprising a copolymer of ethylene and a 1-olefin having at least three carbon atoms per molecule, the copolymer having a density in the range of about 0.928 to about 0.945 and the dielectric material having a dielectric constant of less than about 2.325, a dielectric dissipation factor of less than about 55 microradians at 30 megahertz, and an environmental stress cracking resistance of at least 800 hours.
Inventors
- 👤 James E Pritchard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:50
CPC Classifications
H; H01; H01B; H01B11/00; H01B11/18; H01B11/1834; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; H01B7/00; H01B7/14; H01B7/17; H01B7/28; H01B7/2806
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
43 words
A cable in accordance with claim 1 wherein said cable is a coaxial cable with said at least one first conductor being the inner conductor and said at least one second conductor being an outer conductor surrounding said at least one inner conductor.
Claim 2
Dependent Claim
76 words
A coaxial cable in accordance with claim 2 wherein the density of said copolymer is in the range of about 0.930 to about 0.937, wherein said dielectric constant is in the range of about 2.29 to about 2.31 wherein said dielectric loss factor is in the range of about 20 to about 55 microradians at 30 megahertz, and wherein said dielectric material occupies substantially all of the space between said inner conductor and said outer conductor.
Claim 3
Dependent Claim
35 words
A coaxial cable in accordance with claim 2 wherein said dielectric material further comprises an antioxidant which does not significantly adversely affect either the dielectric constant or the dielectric dissipation factor of said dielectric material.
Claim 4
Dependent Claim
16 words
A coaxial cable in accordance with claim 4 wherein said antioxidant is 1,3,5 trimethyl-2,4,6-tris(3,5 di-tert-butyl-4-hydroxybenzyl) benzene.
Claim 5
Dependent Claim
14 words
A coaxial cable in accordance with claim 4 wherein said antioxidant is 2,6 di-tert-butyl-p-cresol.
Claim 6
Dependent Claim
48 words
A coaxial cable in accordance with claim 2 wherein said copolymer consists essentially of ethylene and n-1-hexene and has an environmental stress cracking resistance of at least 1,000 hours (ASTM D-1693-66) and a melt index in the range of about 0.1 to about 1 gram/10 minutes (ASTM D-1238-65T).
Claim 7
Dependent Claim
17 words
A cable in accordance with claim 1 wherein said copolymer is a copolymer of ethylene and n-1-hexene.
Claim 8
Dependent Claim
17 words
A cable in accordance with claim 1 wherein said copolymer is a copolymer of ethylene and n-1-octene.
Claim 9
Dependent Claim
17 words
A cable in accordance with claim 1 wherein said copolymer is a copolymer of ethylene and n-1-butene.
Claim 10
Dependent Claim
29 words
A cable in accordance with claim 1 wherein said copolymer consists essentially of ethylene and at least one linear 1-olefin having from four to 10 carbon atoms per molecule.
Claim 11
Dependent Claim
32 words
A cable in accordance with claim 11 wherein said dielectric dissipation factor is less than about 40 microradians at 30 megahertz, and said environmental stress cracking resistance is at least 1,000 hours.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |