Patent US4025715A successfully refreshed from Google Patents.
US4025715A
Expired / Lapsed
US
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Shielded electric cable
Assignee: Novelis Corp
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Filing: 1976-03-15
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Granted: 1977-05-24
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Expires: 1996-03-15
Abstract
Abstract Shielded electrical cable of the high voltage type having a central conductor with a semiconducting coating surrounded by polymeric insulation, has a shielding assembly that includes a semiconducting layer around the insulation and a multiplicity of aluminum wires which can be grounded, which are individually coated with semiconducting material, and which are arranged in a long helical wrapping around the coated insulation in relatively close spacing to each other. This structure, especially useful underground, provides very effective shielding and fault-current return paths, with a relatively inexpensive aluminum structure that is nevertheless protected from corrosion. There are also advantages of better mechanical protection and less likelihood of cable damage by differential temperature expansion effects.
Inventors
- 👤 Dennis D. Foley
- 👤 John N. Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:51
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/02; H01B9/025; H01B9/027
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
57 words
A shielded electric cable comprising: (a) a metallic conductor, (b) insulation surrounding said conductor, (c) a layer of semiconducting material around said insulation, and (d) a multiplicity of separate, coated aluminum wires extending lengthwise of the cable and distributed around the exterior of said semiconducting layer, (e) each of said wires having a coating of semiconducting material.
Claim 2
Dependent Claim
57 words
A shielded electric cable comprising: (a) a metallic conductor, (b) insulation surrounding said conductor, (c) a layer of semiconducting material around said insulation, and (d) a multiplicity of separate, coated aluminum wires extending lengthwise of the cable and distributed around the exterior of said semiconducting layer, (e) each of said wires having a coating of semiconducting material.
Claim 3
Dependent Claim
42 words
A cable as defined in claim 1, in which there are at least 10 such coated wires each carrying a thick layer of semiconducting material and in which there is a layer of such material between the central conductor and the insulation.
Claim 4
Dependent Claim
45 words
A cable as defined in claim 1, in which the coated wires are spaced from each other in the circumferential direction around the cable, the average such spacing between the wires being equal to not more than about the outside diameter of each coated wire.
Claim 5
Dependent Claim
25 words
A cable as defined in claim 3, in which there are at least 16 such coated wires each carrying a thick layer of semiconducting material.
Claim 6
Dependent Claim
39 words
A cable as defined in claim 1, in which the total cross-sectional area of the aluminum constituted in said wires, collectively, is sufficient to provide electrical conductivity at least about equal to the conductivity of the first-mentioned metallic conductor.
Claim 7
Dependent Claim
42 words
A cable as defined in claim 1, in which the total cross-sectional area of the aluminum constituted in said wires, collectively, is sufficient to provide electrical conductivity at least equal to about one third of the conductivity of the first-mentioned metallic conductor.
Claim 8
Dependent Claim
25 words
A cable as defined in claim 1, in which there are at least 16 such coated wires each carrying a thick layer of semiconducting material.
Claim 9
Dependent Claim
39 words
A cable as defined in claim 7, in which the total cross-sectional area of the aluminum constituted in said wires, collectively, is sufficient to provide electrical conductivity at least about equal to the conductivity of the first-mentioned metallic conductor.
Claim 10
Dependent Claim
127 words
A shielded electric cable comprising: (a) a metallic conductor, (b) a layer of semiconducting material around said conductor, in contact with its outer surface areas, (c) insulation surrounding said layer, (d) a second layer of semiconducting material, around said insulation, and (e) a multiplicity of separate, coated aluminum wires extending lengthwise of the cable and distributed around the exterior of said second layer, (f) each of said aluminum wires being coated with a layer of semiconducting material, (g) the number of said coated wires, and the gauge of each and the thickness of the coating layer of each, being such that the coated wires are not separated by average spacing, circumferentially of the cable, which is substantially greater than the outside diameter of each said coated wire.
Claim 11
Dependent Claim
127 words
A shielded electric cable comprising: (a) a metallic conductor, (b) a layer of semiconducting material around said conductor, in contact with its outer surface areas, (c) insulation surrounding said layer, (d) a second layer of semiconducting material, around said insulation, and (e) a multiplicity of separate, coated aluminum wires extending lengthwise of the cable and distributed around the exterior of said second layer, (f) each of said aluminum wires being coated with a layer of semiconducting material, (g) the number of said coated wires, and the gauge of each and the thickness of the coating layer of each, being such that the coated wires are not separated by average spacing, circumferentially of the cable, which is substantially greater than the outside diameter of each said coated wire.
Claim 12
Dependent Claim
19 words
A cable as defined in claim 9, in which there are at least 16 such separate, coated aluminum wires.
Claim 13
Dependent Claim
32 words
A cable as defined in claim 9, in which said insulation is a wall of polymeric insulating material in contact with the layer which it surrounds and the layer which surrounds it.
Claim 14
Dependent Claim
30 words
A cable as defined in claim 9, in which the coated aluminum wires are wrapped, in elongated helices, around the said second layer of semiconducting material that covers the insulation.
Claim 15
Dependent Claim
32 words
A cable as defined in claim 12, in which said insulation is a wall of polymeric insulating material in contact with the layer which it surrounds and the layer which surrounds it.
Claim 16
Dependent Claim
26 words
A cable as defined in claim 12, in which the first-mentioned metallic conductor comprises a multiplicity of aluminum wires helically twisted as a unified conductor body.
Claim 17
Dependent Claim
54 words
A cable as defined in claim 14, in which the total cross-sectional area of the aluminum constituted in said coated wires, collectively, is about equal to an area in the range from one third to the while of the total cross-sectional area of the aluminum constituted in said wires, collectively, of the metallic conductor.
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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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |