Patent US4317002A successfully refreshed from Google Patents.
US4317002A
Expired / Lapsed
US
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Multi-core power cable
Assignee: Nortel Networks Ltd
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Filing: 1979-10-24
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Granted: 1982-02-23
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Expires: 1999-10-24
Abstract
Abstract A multi-core power cable (1) in which the conductors comprise a central conductor (2) and two or more tubular conductors (4, 6) coaxial with the central conductor (2), at least the tubular conductors forming the cores. The conductors (2, 4, 6) are isolated from one another by insulating layers (3, 5, 7). A sheath (8) and armoring (9, 10) may also be provided.
Inventors
- 👤 Lyndon R. Spicer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:21
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/04; H01B7/00; H01B7/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A multi-core power cable comprising: a central conductor, a first insulating layer disposed coaxially around said central conductor, at least one tubular intermediate conductor disposed coaxially around said first insulating layer, an intermediate insulating layer disposed coaxially around each said intermediate conductor, an outer tubular conductor disposed coaxially around said intermediate insulating layer, at least one of said conductors comprising a plurality of stranded wires and interstitial spaces, said interstitial spaces being filled with a flexible material, said conductors forming cores and being of substantially equal cross-section, an insulating layer disposed over said outer tubular conductor, a sheath arranged over said insulating layer, and armouring arranged over said sheath.
Claim 2
Dependent Claim
109 words
A multi-core power cable comprising: a central conductor, a first insulating layer disposed coaxially around said central conductor, at least one tubular intermediate conductor disposed coaxially around said first insulating layer, an intermediate insulating layer disposed coaxially around each said intermediate conductor, an outer tubular conductor disposed coaxially around said intermediate insulating layer, at least one of said conductors comprising a plurality of stranded wires and interstitial spaces, said interstitial spaces being filled with a flexible material, said conductors forming cores and being of substantially equal cross-section, an insulating layer disposed over said outer tubular conductor, a sheath arranged over said insulating layer, and armouring arranged over said sheath.
Claim 3
Dependent Claim
16 words
A cable as claimed in claim 1, wherein the armouring comprises two layers of armouring wires.
Claim 4
Dependent Claim
15 words
A cable as claimed in claim 1 wherein the insulating material comprises extruded polymethyl pentene.
Claim 5
Dependent Claim
13 words
A cable according to claim 1, wherein the sheath comprises extruded Nylon 11.
Claim 6
Dependent Claim
16 words
A cable as claimed in claim 2, wherein the armouring wires comprise galvanized plough steel wires.
Claim 7
Dependent Claim
14 words
A cable as claimed in claim 1, wherein the conductors are made of copper.
Claim 8
Dependent Claim
14 words
A cable as claimed in claim 1, wherein said flexible material is silicone rubber.
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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) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |