Patent US4092488A successfully refreshed from Google Patents.
US4092488A
Expired / Lapsed
US
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Connection or terminal portions for cross-linked polyethylene cables
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1975-10-24
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Granted: 1978-05-30
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Expires: 1995-10-24
Abstract
Abstract In the connection or terminal portions of cross-linked polyethylene cables produced by winding irradiated tapes around the connection or terminal portions of cross-linked polyethylene insulated cables and heat molding the same, the irradiated tapes comprise polyethylene and/or an ethylene copolymer as a base resin plus an ethylene-vinyl acetate copolymer containing more than about 15% vinylacetate (VA) in an amount which provides more than an about 2.5% VA content in the irradiated tapes.
Inventors
- 👤 Toshiyuki Hayami
- 👤 Hironaga Matsubara
- 👤 Shousuke Yamanouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:34
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/196; H02G15/003; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12229; Y10T428/12236; Y10T428/249921; Y10T428/249922; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2936; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/31935
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
In the connection or terminal portions of cross-linked polyethylene-insulated cables produced by winding a tape around the connection or terminal portions of the cables and heatmolding the same, the improvement wherein said tapes comprise a blend of polyethylene and/or ethylene copolymer selected from the group consisting of ethylene-propylene copolymers, ethylene-methyl acrylate copolymers, ethylene-ethyl acrylate copolymers, ethylene-styrene copolymers and ethylene-acrylic acid copolymers plus an ethylene-vinyl acetate copolymer having a vinyl acetate of content of more than 15% present in an amount as to provide a vinyl acetate content of more than about 2.5% in said tape, which tape has been electron beam irradiated to a degree that the degree of gelation of said tape is about 20 to about 50%.
Claim 2
Dependent Claim
119 words
In the connection or terminal portions of cross-linked polyethylene-insulated cables produced by winding a tape around the connection or terminal portions of the cables and heatmolding the same, the improvement wherein said tapes comprise a blend of polyethylene and/or ethylene copolymer selected from the group consisting of ethylene-propylene copolymers, ethylene-methyl acrylate copolymers, ethylene-ethyl acrylate copolymers, ethylene-styrene copolymers and ethylene-acrylic acid copolymers plus an ethylene-vinyl acetate copolymer having a vinyl acetate of content of more than 15% present in an amount as to provide a vinyl acetate content of more than about 2.5% in said tape, which tape has been electron beam irradiated to a degree that the degree of gelation of said tape is about 20 to about 50%.
Claim 3
Dependent Claim
104 words
Connection or terminal portions of cross-linked polyethylene insulated cables as claimed in claim 1, wherein said blend comprises polyethylene and/or an ethylene copolymer having a melt index of about 0.1 to about 40 and a density of 0.91 to 0.98 plus an ethylene-vinyl acetate copolymer having a vinyl acetate content of about 15 to about 50% present in an amount as to provide a vinyl acetate content of about 2.5 to about 13% in said tapes, and said tape has a thickness of about 0.1 to about 1.0 mm and has been irradiated with electron beams at about 1 Mrad to about 10 Mrad.
Claim 4
Dependent Claim
32 words
Connection or terminal portions of cross-linked polyethylene insulated cables as claimed in claim 2, wherein the wound tape is heat molded at a temperature of about 120° C to about 270° C.
Claim 5
Dependent Claim
36 words
Connection or terminal portions of cross-linked polyethylene insulated cables as claimed in claim 1, wherein said ethylene-vinyl acetate copolymer has a melt index of about 0.6 to about 70 and a density of 0.92 to 0.98.
Claim 6
Dependent Claim
32 words
Connection or terminal portions of cross-linked polyethylene insulated cables as claimed in claim 4, wherein the ratio of ethylene-vinyl acetate copolymer to polyethylene is from about 1/20 to about 6/1, weight basis.
Claim 7
Dependent Claim
26 words
Connection or terminal portions of cross-linked polyethylene insulated cables as claimed in claim 1, wherein said ethylene copolymer comprises more than about 95% by weight ethylene.
References Cited (Backward Citations)
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Cited
US3527874A
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US3617419A
Cited
US3684821A
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US3840694A
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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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |