US4894284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked polyethylene-insulated cable
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1983-11-08
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Granted: 1990-01-16
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Expires: 2003-11-08
Abstract
Abstract A cable insulated with a cross-linked polyethylene layer is described, wherein the cross-linked polyethylene is prepared by cross-linking with 2,5-dimethyl-2-5-di(tert-butylperoxy)hexane or 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3 as a cross-linking agent. Even if voltage is applied at high temperatures, the breakdown voltage of the cable can be maintained at a high level.
Inventors
- 👤 Shosuke Yamanouchi
- 👤 Yoshiyuki Inoue
- 👤 Masaaki Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:28
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/02; H01B9/027; C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; Y; Y02; Y02A; Y02A30/00; Y02A30/14; Y10; Y10S; Y10S174/00; Y10S174/13; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/294; Y10T428/2942
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
A cross-linked polyethylene-insulated cable comprising a conductor core, an inner semiconductive layer, an outer semiconductive layer and an insulating layer between said inner semiconductive layer and said outer semiconductive layer, wherein the insulating layer has a thickness of at least 6 mm and is made of a cross-linked polyethylene prepared by a dry cross-linking method with 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane or 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3 as a cross-linking agent.
Claim 2
Dependent Claim
63 words
A cross-linked polyethylene-insulated cable comprising a conductor core, an inner semiconductive layer, an outer semiconductive layer and an insulating layer between said inner semiconductive layer and said outer semiconductive layer, wherein the insulating layer has a thickness of at least 6 mm and is made of a cross-linked polyethylene prepared by a dry cross-linking method with 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane or 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3 as a cross-linking agent.
Claim 3
Dependent Claim
23 words
A cross-linked polyethylene-insulated cable as claimed in claim 1, wherein the cross-linking of the polyethylene is performed by dry cross-linking using infrared radiation.
Claim 4
Dependent Claim
26 words
A cross-linked polyethylene-insulated cable as claimed in claim 1, wherein the cross-linking of the polyethylene is performed by dry cross-linking using a hot silicone oil bath.
Claim 5
Dependent Claim
24 words
A cross-linked polyethylene-insulated cable as claimed in claim 1, wherein the cross-linking of the polyethylene is performed by dry cross-linking using hot inert gas.
Claim 6
Dependent Claim
24 words
A cross-linked polyethylene-insulated cable as claimed in claim 1, wherein the cross-linking of the polyethylene is performed by dry cross-linking using a long die.
Claim 7
Dependent Claim
28 words
A cross-linked polyethylene-insulated cable as claimed in claim 1, wherein a water-shielding layer, comprising a metal layer laminated with a water-shielding material, is provided around the insulating layer.
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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) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |