Patent US3816643A successfully refreshed from Google Patents.
US3816643A
Expired / Lapsed
US
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Electrical cable and process
Assignee: EIDP Inc
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Filing: 1973-09-17
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Granted: 1974-06-11
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Expires: 1993-09-17
Abstract
Abstract An electrical cable which can be made by the tandem extrusion process is provided. The electrical cable comprises (1) a core of an electrical conductor, (2) an aluminum shield surrounding the conductor, at least the outer surface treated with a soluble azo compound cross-linking agent for polyethylene and a complex of fumarato chromic (III) nitrate, (3) a layer of a polyolefin having a density within the range of 0.910 to 0.935 surrounding and adhered to the treated surface of the aluminum shield, and polyolefin being polyethylene or a copolymer of ethylene with at least one Alpha -olefin having three to eight carbon atoms (4) an outer jacket of polyethylene containing carbon black surrounding and adhered to the polyolefin layer.
Inventors
- 👤 E Pechhold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:47
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
23 words
The electrical cable of claim 1 wherein the azo compound is selected from the group consisting of 4-t-butylazo-4-cyanovaleric acid, 2-cyano-2''-carbamoylazobisisopropane, and 4,4''-azobis(4-cyanovaleric acid).
Claim 2
Dependent Claim
13 words
The electrical cable of claim 2 wherein the azo compound is 4-t-butylazo-4-cyanovaleric acid.
Claim 3
Dependent Claim
18 words
The electrical cable of claim 1 wherein the aluminum strip is about 5 to 10 mils in thickness.
Claim 4
Dependent Claim
19 words
The electrical cable of claim 1 wherein the polyolefin layer is polyethylene about 1 to 10 mils in thickness.
Claim 5
Dependent Claim
41 words
The electrical cable of claim 1 wherein the outer jacket is 40 to 80 mils in thickness and is polyethylene having a density within the range of 0.910 to 0.935 containing about 2 to 3 percent by weight of carbon black.
Claim 6
Dependent Claim
109 words
An electrical cable comprising (1) a core of an electrical conductor, (2) an aluminum shield 5 to 10 mils in thickness surrounding the conductor, at least the outer surface treated with 4-t-butylazo-4-cyanovaleric acid and a complex of fumarato chromic (III) nitrate, (3) a layer of polyethylene about 1 to 10 mils in thickness, having a density within the range of 0.910 to 0.935 surrounding and adhered to the treated surface of the aluminum shield and (4) an outer jacket 40 to 80 mils in thickness of polyethylene having a density within the range of 0.910 to 0.935 which contAins about 2 to 3 percent by weight of carbon black.
Claim 7
Dependent Claim
20 words
The electrical cable of claim 1 wherein the treated aluminum shield has a lap seam extending lengthwise of the cable.
Claim 8
Dependent Claim
20 words
The electrical cable of claim 7 wherein the treated aluminum shield has a lap seam extending lengthwise of the cable.
Claim 9
Dependent Claim
38 words
A process for making an electrical cable of claim 1 in which the azo compound and complex are applied to the aluminum shield by contacting said shield with an aqueous solution of said complex and said azo compound.
Claim 10
Dependent Claim
23 words
The process of claim 10 in which said azo compound is selected from the group consisting of 4-t-butylazo-4-cyanovaleric acid, 2-cyano-2''-carbamoylazobisisopropane, and 4,4''-azobis(4-cyanovaleric acid).
Claim 11
Dependent Claim
13 words
The process of claim 11 in which said azo compound is 4-t-butylazo-4-cyanovaleric acid.
Claim 12
Dependent Claim
144 words
A double extrusion process for making electrical cable in which a treated aluminum shield is wrapped around a conductor core with a lap seam, a layer of polyolefin having a density within the range of 0.910 to 0.935 is extruded onto said treated aluminum foil, said polyolefin being selected from the group consisting of polyethylene and a copolymer of ethylene with at least one Alpha -olefin having three to eight carbon atoms, and then an outer jacket of polyethylene containing carbon black is extruded onto said polyolefin layer, at least the outer surface of said aluminum shield having been treated by contacting it with a solution in water and about 10 to 30 percent by weight isopropanol of an azo compound cross-linking agent for polyethylene and a complex of fumarato chromic (III) nitrate to provide adhesion between said aluminum shield and said polyolefin layer.
Claim 13
Dependent Claim
23 words
A process of claim 13 in which said azo acid is selected from the group consisting of 4-t-butylazo-4-cyanovaleric acid, 2-cyano-2''-carbamoylazobisisopropane, and 4,4''-azobis(4-cyanovaleric acid).
Claim 14
Dependent Claim
13 words
A process of claim 14 in which said azo acid is 4-t-butylazo-4-cyanovaleric acid.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |