US4008367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power cable with plastic insulation and an outer conducting layer
Assignee: Siemens AG
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Filing: 1975-06-23
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Granted: 1977-02-15
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Expires: 1995-06-23
Abstract
Abstract In a power cable including a central conductor, an extruded inner conductor surrounding the conductor, an inner layer of extruded insulation surrounding the inner conducting layer, an extruded outer conducting layer surrounding the extruded insulation, a metal shield surrounding the outer conducting layer and an outer insulating sheath surrounding the metal shield, an intermediate insulating layer having a mechanical peel strength lower than that of the outer conducting layer and of the inner insulating layer is interposed between the inner insulating layer and the outer conducting layer to permit the outer insulating layer, metal shield and outer conducting layer to be easily peeled away from the inner insulating layer without damage to the outer conducting layer and without leaving a conducting residue on the inner insulating layer.
Inventors
- 👤 Heinz Sunderhauf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:37
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/22; H01B13/24; H01B7/00; H01B7/02; H01B7/0275; H01B9/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
In a power cable including a central conductor, an extruded inner conducting layer surrounding said conductor, an inner layer of extruded insulation surrounding said inner conducting layer, an extruded outer conducting layer surrounding said insulating layer, a metal shield surrounding said outer conducting layer, and an outer insulating layer surrounding said metal shield, an improved construction permitting said outer insulating layer, metal shield and outer conducting layer to be peeled away from said inner insulating layer without damage to said outer conducting layer, comprising an intermediate insulating layer having a mechanical peel strength lower than the mechanical peel strength of the outer conducting layer and of said inner insulating layer, said intermediate insulating layer interposed between said inner insulating layer and said extruded outer conducting layer.
Claim 2
Dependent Claim
126 words
In a power cable including a central conductor, an extruded inner conducting layer surrounding said conductor, an inner layer of extruded insulation surrounding said inner conducting layer, an extruded outer conducting layer surrounding said insulating layer, a metal shield surrounding said outer conducting layer, and an outer insulating layer surrounding said metal shield, an improved construction permitting said outer insulating layer, metal shield and outer conducting layer to be peeled away from said inner insulating layer without damage to said outer conducting layer, comprising an intermediate insulating layer having a mechanical peel strength lower than the mechanical peel strength of the outer conducting layer and of said inner insulating layer, said intermediate insulating layer interposed between said inner insulating layer and said extruded outer conducting layer.
Claim 3
Dependent Claim
31 words
A power cable according to claim 1 wherein the mechanical strength of said intermediate layer is less than 60% of the mechanical strength of the plastic insulation and outer conducting layer.
Claim 4
Dependent Claim
21 words
A power cable according to claim 1 wherein said intermediate layer consists of a plastic material with an olifin polymerisate base.
Claim 5
Dependent Claim
34 words
A power cable according to claim 3 wherein said olifin polymerisate base has mixed therewith at least one of the group of inert mineral fillers consisting of chalk, chalk flint, kaolin, and silicon dioxide.
Claim 6
Dependent Claim
25 words
A power cable according to claim 2 wherein said intermediate layer is one of the group consisting of an insulating varnish and an insulating adhesive.
Claim 7
Dependent Claim
21 words
A power cable according to claim 5 wherein the wall thickness of said intermediate layer is between 0.1 and 0.3 mm.
Claim 8
Dependent Claim
21 words
A power cable according to claim 1 wherein said intermediate layer consists of a plastic material with an olifin polymerisate base.
Claim 9
Dependent Claim
34 words
A power cable according to claim 1 wherein said olifin polymerisate base has mixed therewith at least one of the group of inert mineral fillers consisting of chalk, chalk flint, kaolin, and silicon dioxide.
Claim 10
Dependent Claim
25 words
A power cable according to claim 1 wherein said intermediate layer is one of the group consisting of an insulating varnish and an insulating adhesive.
Claim 11
Dependent Claim
21 words
A power cable according to claim 1 wherein the wall thickness of said intermediate layer is between 0.1 and 0.3 mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |