US4329536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-impregnated power cable
Assignee: Eneos Corp
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Filing: 1980-06-16
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Granted: 1982-05-11
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Expires: 2000-06-16
Abstract
Abstract Provided is an oil-impregnated power cable comprising an insulation layer formed by winding a composite film of polyolefin film and insulating paper onto an electric conductor and impregnated with an impregnating oil, said impregnating oil comprising distillates within a boiling range in terms of values at normal pressure between 265 DEG C. and 360 DEG C. obtained by contacting a hydrocarbon mixture with a boiling range between 75 DEG C. and 198 DEG C. resulting from a thermal cracking of petroleum hydrocarbons at a temperature of 700 DEG C. or higher and containing monocyclic aromatics and aromatic olefins, in liquid phase with an acid catalyst.
Inventors
- 👤 Atushi Sato
- 👤 Isoo Shimizu
- 👤 Keizi Endo
- 👤 Hitoshi Yanagishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:50
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/22; H01B7/00; H01B7/02; H01B7/0208; H01B7/0216; H01B9/00; H01B9/06; H01B9/0611
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
150 words
An oil-impregnated power cable comprising an insulation layer formed by winding a composite film onto an electric conductor and impregnated with an impregnating oil, said composite film comprising a laminate obtained by bonding at least one layer of the insulating paper by means of melt-adhesion or chemical bonding, said impregnating oil comprising distillates within a boiling range in terms of values at normal pressure between 265° C. and 360° C. which distillates contain sulfur compounds in the range of from 10 to 500 ppm and are obtained by contacting a hydrocarbon mixture which mixture results from a thermal cracking of petroleum hydrocarbons at a temperature of 700° C. or higher and which mixture contains principally components with a boiling range between 75° C. and 198° C. consisting essentially of monocyclic aromatics and further contains aromatic olefins of the boiling range just defined above, in liquid phase with an acid catalyst.
Claim 2
Dependent Claim
150 words
An oil-impregnated power cable comprising an insulation layer formed by winding a composite film onto an electric conductor and impregnated with an impregnating oil, said composite film comprising a laminate obtained by bonding at least one layer of the insulating paper by means of melt-adhesion or chemical bonding, said impregnating oil comprising distillates within a boiling range in terms of values at normal pressure between 265° C. and 360° C. which distillates contain sulfur compounds in the range of from 10 to 500 ppm and are obtained by contacting a hydrocarbon mixture which mixture results from a thermal cracking of petroleum hydrocarbons at a temperature of 700° C. or higher and which mixture contains principally components with a boiling range between 75° C. and 198° C. consisting essentially of monocyclic aromatics and further contains aromatic olefins of the boiling range just defined above, in liquid phase with an acid catalyst.
Claim 3
Dependent Claim
62 words
The oil-impregnated power cable as defined in claim 1, in which said treatment with the acid catalyst has been carried out under the conditions of a reaction temperature in the range of from 0° to 200° C., a liquid residence time from 0.1 to 5 hours and an initial concentration of aromatic olefins in the reaction system lower than 10% by weight.
Claim 4
Dependent Claim
25 words
The oil-impregnated power cable as defined in claim 1, in which said polyolefin film is a film of a polyolefin melt-extruded onto the insulating paper.
Claim 5
Dependent Claim
15 words
The oil-impregnated power cable as defined in claim 1, in which said polyolefin is polypropylene.
Claim 6
Dependent Claim
42 words
The oil-impregnated power cable as defined in claim 1, in which said polyolefin film is a film of a silane grafted polyolefin melt-bonded to the insulating paper and being in a cross-linked state created in the presence of a silanol condensation catalyst.
Claim 7
Dependent Claim
21 words
The oil-impregnated power cable as defined in claim 5, in which said silane grafted polyolefin is a silane grafted high-density polyethylene.
References Cited (Backward Citations)
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US3194872A
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US3462358A
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US3775549A
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US4175278A
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US4237334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |