US4870226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-conductor high voltage cable, in particular three-conductor cable
Assignee: NKF Kabel BV
•
Filing: 1988-03-22
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Granted: 1989-09-26
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Expires: 2008-03-22
Abstract
Abstract Multi-conductor high voltage cable, in particular a three-conductor cable, each conductor having an extruded polyolefin conductor insulation, said cable further comprising an extruded polyolefin belt insulation surrounding all insulated conductors and an electrically conducting sheath, surrounding the belt insulation. According to the present invention the conductor insulation of each conductor is surrounded by at least one tape or layer of material comprising cells or cavities and/or at least one tape or layer of material comprising cells or cavities is applied between the belt insulation and all insulated conductors. Preferably said tape or layer is formed by swelling tape.
Inventors
- 👤 Frederik H. Kreuger
- 👤 Antonius M. F. J. Van De Laar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:51
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; H01B7/2855; H01B9/00; H01B9/02; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
59 words
Multi-conductor high voltage cable, in particular a three-conductor cable, each conductor having an extruded polyolefin conductor insulation, further comprising an extruded polyolefin belt insulation surrounding all insulated conductors and an electrically conducting sheath, surrounding the belt insulation, wherein the conductor insulation of each conductor is surrounded by at least one tape or layer of material comprising cells or cavities.
Claim 2
Dependent Claim
59 words
Multi-conductor high voltage cable, in particular a three-conductor cable, each conductor having an extruded polyolefin conductor insulation, further comprising an extruded polyolefin belt insulation surrounding all insulated conductors and an electrically conducting sheath, surrounding the belt insulation, wherein the conductor insulation of each conductor is surrounded by at least one tape or layer of material comprising cells or cavities.
Claim 3
Dependent Claim
73 words
Multi-conductor high voltage cable, in particular a three-conductor cable, each conductor having an extruded polyolefin conductor insulation, further comprising an extruded polyolefin belt insulation surrounding all insulated conductors and an electrically conducting sheath, surrounding the belt insulation, and including a layer of metallic armor surrounding said electrically conducting sheath, and wherein at least one tape or layer of material comprising cells or cavities, is applied between the belt insulation and all insulated conductors.
Claim 4
Dependent Claim
73 words
Multi-conductor high voltage cable, in particular a three-conductor cable, each conductor having an extruded polyolefin conductor insulation, further comprising an extruded polyolefin belt insulation surrounding all insulated conductors and an electrically conducting sheath, surrounding the belt insulation, and including a layer of metallic armor surrounding said electrically conducting sheath, and wherein at least one tape or layer of material comprising cells or cavities, is applied between the belt insulation and all insulated conductors.
Claim 5
Dependent Claim
83 words
Multi-conductor high voltage cable, in particular a three-conductor cable, each conductor having an extruded polyolefin conductor insulation, further comprising an extruded polyolefin belt insulation surrounding all insulated conductors and an electrically conducting sheath surrounding the belt insulation, wherein the conductor insulation of each conductor is surrounded by at least one tape or layer of material comprising cells or cavities and further including at least one tape or layer of material comprising cells or cavities applied between the belt insulation and all insulated conductors.
Claim 6
Dependent Claim
83 words
Multi-conductor high voltage cable, in particular a three-conductor cable, each conductor having an extruded polyolefin conductor insulation, further comprising an extruded polyolefin belt insulation surrounding all insulated conductors and an electrically conducting sheath surrounding the belt insulation, wherein the conductor insulation of each conductor is surrounded by at least one tape or layer of material comprising cells or cavities and further including at least one tape or layer of material comprising cells or cavities applied between the belt insulation and all insulated conductors.
Claim 7
Dependent Claim
29 words
Multi-conductor cable as claimed in one of claims 1 or 2, characterized in that the at least one tape or layer consists of one or more non-woven fibre films.
Claim 8
Dependent Claim
25 words
Multi-conductor cable as claimed in one of claims 1 or 2, characterized in that the at least one tape or layer consists of woven material.
Claim 9
Dependent Claim
33 words
Multi-conductor cable as claimed in one of claims 1 or 2, characterized in that the at least one tape or layer consists of foam plastic or foam rubber having closed or open cells.
Claim 10
Dependent Claim
24 words
Multi-conductor cable as claimed in one of claims 1 or 2, characterized in that the at least one tape or layer consists of powder.
Claim 11
Dependent Claim
32 words
Multi-conductor cable as claimed in one of claims 1 or 2, characterized in that the at least one tape or layer is composed of a multi-layer composite comprising a plurality of layers.
Claim 12
Dependent Claim
26 words
Multi-conductor cable as claimed in one of claims 1 or 2, characterized in that the at least one tape or layer is formed from swelling tape.
Claim 13
Dependent Claim
43 words
Multi-conductor cable as claimed in claims 1 or 2, characterized in that the at least one tape or layer is of such thickness that upon twisting the insulated conductors and applying the belt insulation all cavities and slits between adjoining parts are filled.
Claim 14
Dependent Claim
36 words
Multi-conductor cable as claimed in claims 1 or 2, characterized in that the at least one tape or layer consists of a swelling tape and formed of a fibre film of polypropylene impregnated with cellulose powder.
Claim 15
Dependent Claim
32 words
Multi-conductor cable as claimed in claims 1 or 2, the polyolefin conductor insulation and/or belt insulation consists of ethylene propylene rubber (EPR); high density or low density polyethylene; cross-linked polyethylene or polypropylene.
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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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |