US3852518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Irradiation cross-linked composite low density/high density polyethylene insulated 600 volt power cables
Assignee: General Cable Corp
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Filing: 1973-11-29
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Granted: 1974-12-03
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Expires: 1993-11-29
Abstract
Abstract This underground power and service entrance cable is insulated with two layers of polyethylene insulation, the inner layer being low density polyethylene and the outer layer being high density polyethylene with the layers fused together and cross-linked. The insulation is thus a thermoset construction. It provides a cable with insulation which is mechanically stronger, of more economical design, thermoset throughout its full thickness and of superior stability in water; the latter being an advantage when used underground.
Inventors
- 👤 B Wargotz
- 👤 D Silver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:47
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/02; H01B7/0275; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A POWER CABLE COMPRISING A CONDUCTOR CORE, A COMPOSITE INSULATION SURROUNDING THE CORE AND COMPRISING AN INNER LAYER OF INSULATION MADE OF CROSS-LINKED LOW DENSITY POLYETHYLENE AND AN OUTER INSULATION APPLIED OVER THE INNER INSULATION TO GIVE THE CABLE IMPROVED IMPACT, SCORE ABD ABRASION RESISTANCE, THE OUTER INSULATION BEING CROSS-LINKED HIGH DENSITY POLYEHYLENE.
Claim 2
Dependent Claim
53 words
A POWER CABLE COMPRISING A CONDUCTOR CORE, A COMPOSITE INSULATION SURROUNDING THE CORE AND COMPRISING AN INNER LAYER OF INSULATION MADE OF CROSS-LINKED LOW DENSITY POLYETHYLENE AND AN OUTER INSULATION APPLIED OVER THE INNER INSULATION TO GIVE THE CABLE IMPROVED IMPACT, SCORE ABD ABRASION RESISTANCE, THE OUTER INSULATION BEING CROSS-LINKED HIGH DENSITY POLYEHYLENE.
Claim 3
Dependent Claim
35 words
The power cable described in claim 1 characterized by the inner insulation being in direct contact with a conductor comprising the core of the cable, and the high and low density polyethylene being fused together.
Claim 4
Dependent Claim
21 words
The power cable described in claim 1 characterized by the polyethylene of the insulation being thermoset as a result of cross-linking.
Claim 5
Dependent Claim
29 words
The power cable described in claim 1 characterized by the inner layer of the polyethylene insulation having better electrical and electrical stability in water characteristics than the outer layer.
Claim 6
Dependent Claim
40 words
The power cable described in claim 1 characterized by the cable being a 600 volt underground and service entrance cable with the outer layer of superior electrical stability in water as a result of the cross-linking of the outer layer.
Claim 7
Dependent Claim
37 words
The underground and service entrance cable described in claim 5 characterized by the insulation being free of chemical cross-linking ingredients and having irradiation induced cross-linking to increase the resistance of the high density polyethylene, to stress cracking.
Claim 8
Dependent Claim
41 words
The power cable described in claim 1 characterized by the inner layer of polyethylene having a density of about 0.910 -0.940 grams per cubic centimeter, and the outer layer having a density of about 0.941 - 0.965 grams per cubic centimeter.
Claim 9
Dependent Claim
42 words
The power cable described in claim 2 characterized by the conductor being of a size of 1,000 kcmil and smaller, and the combined thickness of the high density and low density polyethylene layers being between about three sixty-fourths to six sixty-fourths inches.
References Cited (Backward Citations)
GB860811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |