Patent US4361723A successfully refreshed from Google Patents.
US4361723A
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Insulated high voltage cables
Assignee: Hubbell Inc
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Filing: 1981-03-16
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Granted: 1982-11-30
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Expires: 2001-03-16
Abstract
Abstract There is provided an insulated high voltage cable which possesses the property of lower dielectric losses than prior art cables. The cable comprises a conductor insulated with at least two laminar layers of insulating material. At least one of the layers is relatively thick and has a low SIC. At least one other of the layers has a high SIC and is in contact with a surface of the low SIC layer. The high SIC layer is relatively thin and has a tan δ/SIC value no greater than 0.005 over a temperature range of 40° to 90° C.
Inventors
- 👤 Andrew Hvizd, Jr.
- 👤 Richard T. Pye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:27
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/02; H01B9/027; Y; Y10; Y10S; Y10S174/00; Y10S174/13; Y10S174/26; Y10S174/27; Y10S174/28; Y10S174/31
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
An insulated high voltage cable comprising a conductor insulated with at least two laminar layers of insulating material, at least one of said layers being relatively thick and having a low SIC of no greater than 4.5, at least one other of said layers having a high SIC of 7 or more and being in contact and interfacing with a surface of said low SIC layer, said high SIC layer being relatively thin and having a tan δ/SIC value no greater than 0.005 over a temperature range of 40° to 90° C.
Claim 2
Dependent Claim
92 words
An insulated high voltage cable comprising a conductor insulated with at least two laminar layers of insulating material, at least one of said layers being relatively thick and having a low SIC of no greater than 4.5, at least one other of said layers having a high SIC of 7 or more and being in contact and interfacing with a surface of said low SIC layer, said high SIC layer being relatively thin and having a tan δ/SIC value no greater than 0.005 over a temperature range of 40° to 90° C.
Claim 3
Dependent Claim
41 words
A cable as defined in claim 1 wherein said conductor is coated with successive layers comprising a thin layer of high SIC material, a thick layer of low SIC material, a layer of semiconducting material and a layer of conductive material.
Claim 4
Dependent Claim
48 words
A cable as defined in claim 1 wherein said conductor is coated with successive layers comprising a layer of semiconducting material, a thin layer of said high SIC material, a thick layer of said low SIC material, a layer of semiconducting material and a layer of conductive material.
Claim 5
Dependent Claim
57 words
A cable as defined in claim 1 wherein said conductor is coated with successive layers comprising a thin layer of said high SIC material, a thick layer of said low SIC material, a thin layer of high SIC material having an SIC of 7 or greater, a layer of semiconducting material and a layer of conductive material.
Claim 6
Dependent Claim
44 words
A cable as defined in claim 1 wherein the SIC of the thick low SIC layer is in the range about 2 to about 4.5 and the SIC of the thin high SIC layer is in the range of about 7 to about 1500.
Claim 7
Dependent Claim
15 words
A cable as defined in claim 5 wherein the thick layer of insulation is crosslinked.
Claim 8
Dependent Claim
15 words
A cable as defined in claim 5 wherein the thick layer of insulation is thermoplastic.
Claim 9
Dependent Claim
15 words
A cable as defined in claim 5 wherein the thin layer of insulation is crosslinked.
Claim 10
Dependent Claim
15 words
A cable as defined in claim 5 wherein the thin layer of insulation is thermoplastic.
Claim 11
Dependent Claim
21 words
A cable as defined in claims 1 or 2 wherein said thin layer of insulation is less than 50 mils thick.
Claim 12
Dependent Claim
24 words
A cable as defined in claim 4 wherein the second recited thin layer of high SIC material is no greater than 100 mils thick.
References Cited (Backward Citations)
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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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |