US3668128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulating oil, and to electrical apparatus incorporating them
Assignee: Balfour Beatty PLC
•
Filing: 1970-01-02
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Granted: 1972-06-06
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Expires: 1990-01-02
Abstract
Abstract An insulating oil which has good resistance to oxidation and which is also non-gassing and of low viscosity comprises from 150 percent (by weight) of a residually unsaturated alkene polymer, and correspondingly from 99-50 percent of a low viscosity hydrocarbon oil. The polymer is derived predominantly from an alkene or alkenes having from three to five carbon atoms and has an average molecular weight in the range 100-900, preferably in the range 250-500. A mixture of such alkene polymers may be used. The hydrocarbon oil is preferably a mineral oil, and has a viscosity of 30 centistokes or less at 20* C.
Inventors
- 👤 John Kenneth Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:40
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/22; C; C05; C05B; C05B11/00; C05B11/04; C05B11/08; C10; C10M; C10M143/00; C10M143/04; C10M143/06; C10M143/08; C10M2203/00; C10M2203/10; C10M2203/1006; C10M2203/102; C10M2203/1025; C10M2203/106; C10M2203/1065; C10M2205/00; C10M2205/02; C10M2205/024; C10M2205/026; C10M2205/028; C10N; C10N2020/00; C10N2020/01; C10N2020/02; C10N2020/04; C10N2030/00; C10N2030/10; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
22 words
An insulating oil as claimed in claim 1 in which the molecular weight of said alkene polymer is in the range 100-700.
Claim 2
Dependent Claim
22 words
An insulating oil as claimed in claim 2 in which the molecular weight of said alkene polymer is in the range 250-500.
Claim 3
Dependent Claim
17 words
Electrical apparatus comprising a body of insulating material impregnated with the insulating oil claimed in claim 1.
Claim 4
Dependent Claim
20 words
An oil-filled paper insulated electric cable in which the paper is impregnated with the insulating oil claimed in claim 1.
Claim 5
Dependent Claim
81 words
An insulating oil which has good resistance to oxidation and which is also non-gassing and of low viscosity comprising a. from 1-50 percent by weight of at least one residually unsaturated alkene polymer having an average molecular weight in the range 100-900, and derived predominately from at least one alkene having from three to five carbon atoms and b. correspondingly from 99-50 percent of a low viscosity refined mineral oil having a viscosity of 30 centistokes or less at 20* C.
Claim 6
Dependent Claim
14 words
An insulating oil as claimed in claim 6 in which said alkene is butene.
Claim 7
Dependent Claim
22 words
An insulating oil as claimed in claim 6 in which the molecular weight of said alkene polymer is in the range 100-700.
Claim 8
Dependent Claim
22 words
An insulating oil as claimed in claim 8 in which the molecular weight of said alkene polymer is in the range 250-500.
Claim 9
Dependent Claim
35 words
An insulating oil as claimed in claim 9 suitable for use in accessories of oil-filled cables having internal oil channels and for use in pipe-type cables and comprising from 10-40 percent of said alkene polymer.
Claim 10
Dependent Claim
40 words
An insulating oil as claimed in claim 9 suitable for use in oil-filled cables having internal oil channels comprising from 5-15 percent by weight of said alkene polymer, and correspondingly from 95-85 percent of said low viscosity refined mineral oil.
Claim 11
Dependent Claim
16 words
An insulating oil as claimed in claim 11 in which said alkene polymer is a polybutene.
Claim 12
Dependent Claim
19 words
An oil-filled paper-insulated electric cable in which the paper is impregnated with the insulating oil claimed in claim 11.
Claim 13
Dependent Claim
19 words
An insulating oil as claimed in claim 6 in which the refined mineral oil is predominately naphthEnic in character.
Claim 14
Dependent Claim
19 words
An insulating oil as claimed in claim 6 in which the refined mineral oil is of mixed naphthenic/paraffinic composition.
Claim 15
Dependent Claim
18 words
Electrical apparatus comprising a body of insulating material impregnated with the insulating oil as claimed in claim 6.
Claim 16
Dependent Claim
20 words
An oil-filled paper insulated electric cable in which the paper is impregnated with the insulating oil claimed in claim 6.
References Cited (Backward Citations)
US2719182A
Cited
US2921011A
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US2870385A
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US2993156A
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US3163705A
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US3573209A
Cited
US3318799A
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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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |