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 03:37
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.
References Cited (Backward Citations)
US2995616A
Cited
GB610488A
Cited
US2890263A
Cited
US3394400A
Cited
US3479621A
Cited
US3766309A
Cited
US3745232A
Cited
US3843830A
Cited
US3943271A
Cited
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 |