Patent US4305849A successfully refreshed from Google Patents.
US4305849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin composition containing high molecular weight polyethylene glycol useful for electrical insulation
Assignee: NUC Corp
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Filing: 1980-08-15
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Granted: 1981-12-15
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Expires: 2000-08-15
Abstract
Abstract A polyolefin composition for electrical insulation which comprises polyolefin or crosslinked polyolefin and a small quantity of high-molecular weight polyethylene glycol. This composition is far less vulnerable to the deterioration that occurs as dendroid voids when employed as an electrical insulation of high-tension power cables which are operated under water. The polyethylene glycol has more than 44 carbon atoms and is used in an amount from 0.3 to 10 wt % based on polyolefin.
Inventors
- 👤 Youichi Kawasaki
- 👤 Kenji Igarashi
- 👤 Seiho Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:27
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/14; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0846; C08L23/0853; C08L71/00; C08L71/02; C08L2312/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
An electrical insulation composition, comprising: an organic polymeric electrical insulating material selected from the group consisting of polyolefin and crosslinked polyolefin, said insulating material containing blended therein from 0.3 to 10% by weight, based on the weight of said insulating material, of high molecular weight polyethylene glycol having more than 44 carbon atoms in the molecule.
Claim 2
Dependent Claim
56 words
An electrical insulation composition, comprising: an organic polymeric electrical insulating material selected from the group consisting of polyolefin and crosslinked polyolefin, said insulating material containing blended therein from 0.3 to 10% by weight, based on the weight of said insulating material, of high molecular weight polyethylene glycol having more than 44 carbon atoms in the molecule.
Claim 3
Dependent Claim
26 words
An electrical insulation composition as claimed in claim 1 in which said high molecular weight polyethylene glycol contains more than 80 carbon atoms in the molecule.
Claim 4
Dependent Claim
26 words
An electrical insulation composition as claimed in claim 1 in which said high molecular weight polyethylene glycol has a molecular weight of from 1,000 to 20,000.
Claim 5
Dependent Claim
19 words
An electrical insulation composition as claimed in claim 1 consisting essentially of said insulating material and said polyethylene glycol.
Claim 6
Dependent Claim
23 words
An electrical insulation composition as claimed in claim 4 containing from 0.5 to 1.0% by weight of said high molecular weight polyethylene glycol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |