Patent US3067644A successfully refreshed from Google Patents.
US4458103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating joint for rubber or plastic insulated power cable
Assignee: Furukawa Electric Co Ltd
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Filing: 1983-03-07
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Granted: 1984-07-03
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Expires: 2003-03-07
Abstract
Abstract In an insulating joint for a rubber or plastic insulated power cable, insulation shields are formed around insulation layers covering cable conductor joint portions of adjacent cables so that the insulation shields are longitudinally opposed to each other with a layer with high dielectric constant and high volume resistivity interposed therebetween. The layer comprises a mixture consisting of 100 parts by weight of a rubber or plastic as a base, 50 to 700 parts by weight of one or both of silicon carbide or zinc oxide, and 2 to 60 parts by weight of carbon black.
Inventors
- 👤 Shin-ichi Irie
- 👤 Yasuhiro Yamashita
- 👤 Takao Nakano
- 👤 Teruyoshi Tanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:56
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/08; H02G15/10; H02G15/103; H02G1/00; H02G1/14; H02G1/145; H02G15/003; H02G15/115
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
An insulating joint for joining two rubber or plastic insulated power cables which are adjacent each other longitudinally, said cables having conductors which are joined at a joint portion, said insulating joint having an insulation shield means around an insulation layer covering said cable conductor joint portion, the improvements wherein: said insulation shield means of said cable joint comprises respective shield members longitudinally opposed to each other and having respective ends which are spaced from each other in the longitudinal direction of said cables; and a layer having a high dielectric constant and a high volume resistivity is interposed therebetween in said longitudinal space, said layer with high dielectric constant and high volume resistivity comprising a mixture consisting of 100 parts by weight of a rubber or plastic as a base, 50 to 700 parts by weight of one or both of silicon carbide or zinc oxide, and 2 to 60 parts by weight of carbon black.
Claim 2
Dependent Claim
157 words
An insulating joint for joining two rubber or plastic insulated power cables which are adjacent each other longitudinally, said cables having conductors which are joined at a joint portion, said insulating joint having an insulation shield means around an insulation layer covering said cable conductor joint portion, the improvements wherein: said insulation shield means of said cable joint comprises respective shield members longitudinally opposed to each other and having respective ends which are spaced from each other in the longitudinal direction of said cables; and a layer having a high dielectric constant and a high volume resistivity is interposed therebetween in said longitudinal space, said layer with high dielectric constant and high volume resistivity comprising a mixture consisting of 100 parts by weight of a rubber or plastic as a base, 50 to 700 parts by weight of one or both of silicon carbide or zinc oxide, and 2 to 60 parts by weight of carbon black.
Claim 3
Dependent Claim
71 words
An insulating joint according to claim 1, wherein the base of said layer with high dielectric constant and high volume resistivity is a member selected from the group consisting of low-, medium- and high-density polyethylene; an ethylene-propylene copolymer; an ethylene-propylene-diene monomer terpolymer; an ethylene-α-olefin-polyene terpolymer; an ethylene-ethyl acrylate copolymer; an ethylene-vinyl acetate copolymer; ethylene-propylene rubber; ethylene-vinyl acetate rubber; acrylic rubber; fluororubber; butadiene rubber; styrene-butadiene rubber; mixtures thereof; and crosslinked materials thereof.
Claim 4
Dependent Claim
49 words
An insulating joint according to claim 1, wherein said insulation layer comprises a member selected from the group consisting of low-, medium- and high-density polyethylene; an ethylene-propylene copolymer; an ethylene-propylene-diene monomer terpolymer; an ethylene-α-olefin-polyene terpolymer; an ethylene-ethyl acrylate copolymer; an ethylene-vinyl acetate copolymer; mixtures thereof; and crosslinked materials thereof.
References Cited (Backward Citations)
GB1433129A
Cited
FR2294568A1
Cited
FR2431784A1
Cited
JPS55117820A
Cited
EP0022660A1
Cited
EP0026733A1
Cited
GB2038111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |