US3586756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical cable with protective coating or shielding tape
Assignee: General Cable Corp
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Filing: 1969-04-30
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Granted: 1971-06-22
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Expires: 1989-04-30
Abstract
Abstract In order to obtain the tenacious adherence of polyethylene copolymer without the cost of the copolymer, this cable has polyethylene protection on the metal foil of the shielding layer with the polyethylene a homopolymer throughout a substantial part of its thickness and changing to copolymer characteristics adjacent to the face of the foil.
Inventors
- 👤 Oscar G Garner
- 👤 Ludwik Jachimowicz
- 👤 Joseph B Masterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:44
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/2825; H01B11/00; H01B11/02; H01B11/06; H01B11/10; H01B11/1016; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; H01B7/2806; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/2419; Y10T428/24215; Y10T428/24231; Y10T428/2424; Y10T428/24248; Y10T428/24256; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/266; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
214 words
In an electrical cable of the type having a core including a conductor and polyolefin electrical inSulation around the conductor, a shield around the insulation, and an outer jacket surrounding the shield, the improvement which comprises the shield including a metal strip with corrosion protective polyolefin coating on the outside of the strip, and which is in addition to the jacket surrounding the shielding, said jacket being a polyolefin extrusion in contact with the coating on the shield, the coating being a mass of the same polyolefin for the full thickness thereof with no internal physical boundaries and with resulting mechanical and chemical radial continuity of the coating from the metal outwardly, the inner part of the coating in contact with the metal being a polymer having carboxyl groups dispersed therein for obtaining strong adherence to the metal and the part of the coating outward from the metal strip being of the same material as the inner part but without the carboxyl groups whereby it will not bond to the metal of the strip or to the jacket as effectively as the inner part of the coating, the reactive groups being concentrated in the part of the coating that contacts with the strip and decreasing as the coating extends radially away from the strip.
Claim 2
Dependent Claim
214 words
In an electrical cable of the type having a core including a conductor and polyolefin electrical inSulation around the conductor, a shield around the insulation, and an outer jacket surrounding the shield, the improvement which comprises the shield including a metal strip with corrosion protective polyolefin coating on the outside of the strip, and which is in addition to the jacket surrounding the shielding, said jacket being a polyolefin extrusion in contact with the coating on the shield, the coating being a mass of the same polyolefin for the full thickness thereof with no internal physical boundaries and with resulting mechanical and chemical radial continuity of the coating from the metal outwardly, the inner part of the coating in contact with the metal being a polymer having carboxyl groups dispersed therein for obtaining strong adherence to the metal and the part of the coating outward from the metal strip being of the same material as the inner part but without the carboxyl groups whereby it will not bond to the metal of the strip or to the jacket as effectively as the inner part of the coating, the reactive groups being concentrated in the part of the coating that contacts with the strip and decreasing as the coating extends radially away from the strip.
Claim 3
Dependent Claim
121 words
The combination described in claim 1 characterized by the polyolefin being polyethylene and being polar because of the reactive carboxyl groups, and the polyolefin of the outer part of the coating also being polyethylene containing substantially no carboxyl groups and being nonpolar, the outer part of the coating completely covering the inner part whereby the polar polyethylene is protected from reaction with metal salts in ground water which contacts with the outside surface of the coating on the cable shield, and the outer part and inner part of the coating merging into one another the carboxyl groups distributed through the polyethylene of the inner part of the coating giving said inner part polar characteristics for obtaining tenacious adherence to the metal.
Claim 4
Dependent Claim
39 words
The combination described in claim 2 characterized by the metal strip being an aluminum tape having corrosion protective coating on both sides, the coating on at least the outside of the tape being the coating described in claim 1.
Claim 5
Dependent Claim
35 words
The combination described in claim 1 characterized by the outer part of the coating being a high molecular weight polyethylene homopolymer, and the inner part of the coating being polar polyethylene with reactive carboxyl groups.
Claim 6
Dependent Claim
58 words
The combination described in claim 1 characterized by the strip extending around the circumference of the core and having a longitudinal seam with opposite edge portions of the strip in contact with one another at the seam, and corrosion protecting coating on the contacting opposite edge portions of the strip bonded to one another to close the seam.
Claim 7
Dependent Claim
57 words
The combination described in claim 1 characterized by the inner and outer parts of the coating being fused together where they merge into one another to form the mass of the same polyolefin for the full thickness thereof with no internal physical boundaries and with resulting mechanical and chemical continuity of the coating from the metal outward.
Claim 8
Dependent Claim
34 words
The combination described in claim 1 characterized by the reactive groups being supplied to from 5 to 50 percent of the radial extent of the coating depending upon the total thickness of the coating.
Claim 9
Dependent Claim
38 words
The combination described in claim 7 characterized by the metal strip having a thickness of 1 to 3 mils and the coating on one side of the strip having a radial extent of approximately 2 to 4 mils.
Claim 10
Dependent Claim
29 words
The combination described in claim 7 characterized by the inner part of the coating having the carboxyl groups being of a radial thickness of from 0.1 to 2.0 mils.
Claim 11
Dependent Claim
25 words
The combination described in claim 2 characterized by the part of the coating that has the carboxyl groups being an electrophoretically deposited copolymer of polyethylene.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |