US4472597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water impervious rubber or plastic insulated power cable
Assignee: Furukawa Electric Co Ltd
•
Filing: 1983-04-11
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Granted: 1984-09-18
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Expires: 2003-04-11
Abstract
Abstract A rubber or plastic insulated power cable is provided wherein a water impervious tape is formed on a cable core through an electrically conductive tape. Fracture due to fatigue of the metal foil of the water impervious tape which is caused by friction between a metal shield layer of the cable core and a jacket as an outermost layer is prevented. Water impervious performance of the cable is not degraded over a long period of time.
Inventors
- 👤 Tadayuki Uematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:31
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/2825; H01B9/00; H01B9/02; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
In a rubber or plastic insulated power cable comprising a cable core having a conductor, an extruded conductor shield, a rubber or plastic insulation layer and an extruded insulation shield; a metal shield layer; and an outermost jacket, the improvement comprising: an electrically conductive tape layer formed on said metal shield layer; and a water impervious layer including a laminated tape of a lead foil tape with an electrically conductive rubber or plastic layer formed on at least one surface thereof, said water impervious layer being longitudinally laid over said electrically conductive tape layer such that said electrically conductive rubber or plastic layer faces said metal shield layer; and said water impervious layer being securely adhered to an inner surface of said jacket.
Claim 2
Dependent Claim
123 words
In a rubber or plastic insulated power cable comprising a cable core having a conductor, an extruded conductor shield, a rubber or plastic insulation layer and an extruded insulation shield; a metal shield layer; and an outermost jacket, the improvement comprising: an electrically conductive tape layer formed on said metal shield layer; and a water impervious layer including a laminated tape of a lead foil tape with an electrically conductive rubber or plastic layer formed on at least one surface thereof, said water impervious layer being longitudinally laid over said electrically conductive tape layer such that said electrically conductive rubber or plastic layer faces said metal shield layer; and said water impervious layer being securely adhered to an inner surface of said jacket.
Claim 3
Dependent Claim
34 words
A power cable according to claim 1, wherein said insulation layer of said cable core comprises an electrically insulating composition selected from the group consisting of crosslinked polyethylene, polyethylene, ethylene-propylene rubber and butyl rubber.
Claim 4
Dependent Claim
39 words
A power cable according to claim 1, wherein said metal shield layer of said cable core comprises a metallic material selected from the group consisting of a copper tape, an aluminum tape, a copper wire, and an aluminum wire.
References Cited (Backward Citations)
US2132259A
Cited
US2446387A
Cited
GB886417A
Cited
US2948772A
Cited
US3472692A
Cited
US3507978A
Cited
US3575748A
Cited
GB1375677A
Cited
US4360704A
Cited
US4342880A
Cited
US4398058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |