US4081393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulating oils containing trialkyl benzenes
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1976-12-15
•
Granted: 1978-03-28
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Expires: 1996-12-15
Abstract
Abstract Electrical oils which are blends of specified trialkyl benzenes and mineral oils have improved gas absorption and oxidation stability.
Inventors
- 👤 Jean-Paul Berthelot
- 👤 Pierre Dominique Marin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:31
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
An electrical insulating oil having hydrogen absorption and oxidation stability comprising from 5 to 80% by weight of a trialkyl benzene of the general formula: ##STR2## wherein R 1 , R 2 and R 3 are all alkyl groups, with R 1 and R 2 containing no more than 6 carbon atoms and R 3 containing from 5 to 15 carbon atoms and from 95 to 20% by weight of a mineral oil.
Claim 2
Dependent Claim
73 words
An electrical insulating oil having hydrogen absorption and oxidation stability comprising from 5 to 80% by weight of a trialkyl benzene of the general formula: ##STR2## wherein R 1 , R 2 and R 3 are all alkyl groups, with R 1 and R 2 containing no more than 6 carbon atoms and R 3 containing from 5 to 15 carbon atoms and from 95 to 20% by weight of a mineral oil.
Claim 3
Dependent Claim
22 words
An electrical insulating oil according to claim 1 in which R 1 and R 2 contain no more than 3 carbon atoms.
Claim 4
Dependent Claim
25 words
An electrical insulating oil according to claim 1, wherein said oil consists essentially of said trialkyl benzene and 25 to 35% of said mineral oil.
Claim 5
Dependent Claim
29 words
An electrical insulating oil according to claim 1 in which R 3 is selected from the group consisting of C 9 H 19 and C 12 H 25 radicals.
Claim 6
Dependent Claim
19 words
An electrical insulating oil according to claim 1 containing from 25 to 85% by weight of the mineral oil.
Claim 7
Dependent Claim
29 words
An electrical insulating oil according to claim 1 in which R 1 and R 2 are both methyl groups and are in the ortho position relative to each other.
Claim 8
Dependent Claim
15 words
An electrical insulating oil according to claim 6, wherein R 3 is a nonyl group.
Claim 9
Dependent Claim
15 words
An electrical insulating oil according to claim 6, wherein R 3 is a dodecyl group.
References Cited (Backward Citations)
US2810770A
Cited
US2810769A
Cited
US3036010A
Cited
US3163705A
Cited
GB1142047A
Cited
US3673093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |