Patent US4020276A successfully refreshed from Google Patents.
US4020276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealant barrier for electrical cables
Assignee: SCAL - CONDITIONNEMENTS EN ALUMINUM Ste
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Filing: 1976-03-19
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Granted: 1977-04-26
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Expires: 1996-03-19
Abstract
Abstract A longitudinal sealant barrier for cables carrying electrical energy which barrier is situated between a metal screen and a semiconductor layer covering the insulation of the metal core of the cable. It comprises a continuous or discontinuous layer arranged on the internal surface of the screen of a thermofusible mixture and a succession of rings of the same mixture, each ring being optionally provided on the side of the layer with a layer of a cellulose derivative.
Inventors
- 👤 Jean-Marie Maingueneau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:39
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; C; C08; C08F; C08F6/00; C08F6/26; C08L; C08L21/00; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
In an electrical cable having a metal core, an insulation covering the core, a semiconductive layer over the insulation covering and a metal screen, the improvement comprising a longitudinal sealant barrier between said screen and said semiconductive layer, said barrier comprising a layer of a thermofusible mixture coated on the inner surface of said screen and a plurality of spaced rings formed of the same material between said coating and said semiconductive layer.
Claim 2
Dependent Claim
73 words
In an electrical cable having a metal core, an insulation covering the core, a semiconductive layer over the insulation covering and a metal screen, the improvement comprising a longitudinal sealant barrier between said screen and said semiconductive layer, said barrier comprising a layer of a thermofusible mixture coated on the inner surface of said screen and a plurality of spaced rings formed of the same material between said coating and said semiconductive layer.
Claim 3
Dependent Claim
16 words
A sealant barrier according to claim 1 wherein said layer of a thermofusible mixture is continuous.
Claim 4
Dependent Claim
43 words
A sealant barrier according to claim 1, wherein said layer of a thermofusible mixture is discontinuous and is in the form of a plurality of rings situated in the same plane perpendicular to the axis of the cable as the first mentioned rings.
Claim 5
Dependent Claim
27 words
A sealant barrier according to claim 1 wherein the thermofusible mixture is semiconducting and has a high viscosity of the order of 20,000 centipoise at 150° C.
Claim 6
Dependent Claim
47 words
A sealant barrier according to claim 4 wherein the thermofusible mixture forming the first mentioned rings comprises by weight 40 to 70% of a copolymer of ethylene and vinyl acetate, 15 to 20% of hydrogenated collophane resin, and 5 to 20% of collophane resin and synthetic hydrocarbon.
Claim 7
Dependent Claim
50 words
A sealant barrier according to claim 4 wherein said thermofusible mixture comprises by weight 40 to 70% of a copolymer of ethylene and vinyl acetate, 15 to 30% of hydrogenated collophane derivatives, in particular esters, 5 to 20% of collophane resin and synthetic hydrocarbon, and up to 40% of graphite.
Claim 8
Dependent Claim
35 words
A sealant barrier according to claim 1 wherein said rings are provided with a layer of a substance on the side of the semiconducting layer covering the insulation which expands in the presence of water.
Claim 9
Dependent Claim
16 words
A sealant barrier according to claim 7 wherein the said substance forming the layer is carboxymethylcellulose.
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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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |