Patent US3909435A successfully refreshed from Google Patents.
US3909435A
Expired / Lapsed
US
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Reaction product of naphthenic acids useful as insulating oil
Assignee: JNC Corp
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Filing: 1973-06-11
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Granted: 1975-09-30
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Expires: 1993-06-11
Abstract
Abstract An insulating composition useful as insulating oil, which can be substituted for PCB and yet has excellent characteristic properties for insulation comparable to PCB, can be obtained by heating naphthenic acids alone or a mixture of naphthenic acids and a saturated, aliphatic carboxylic acid or a saturated aliphatic aldehyde, at a temperature of 200*-700*C, under a pressure of 0.1 - 10 atm, and in the presence of a specified catalyst, followed by neutralization treatment and removal of low boiling fractions.
Inventors
- 👤 Isao Koga
- 👤 Masahiro Fukui
- 👤 Takehiko Okamoto
- 👤 Masaru Shimada
- 👤 Taizo Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:33
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
132 words
A COMPOSITION USEFUL AS AN UNSULATING OIL OBTAINED BY HEATING NAPHTHENIC ACIDS ALONE OR A MIXTURE OF NAPHTHENIC ACIDS AND A SATURATED ALIPHATIC CARBOXYLIC ACID HAVING A CARBON NUMBER OF 2 TO 18 OR A SATURATED ALIPHATIC ALDEHYDE HAVING A CARBON NUMBER OF 2 TO 18, AT A TEMPERATURE OF 200* -700*C, UNDER A PRESSURE OF 0.1 - 10 ATM, AND IN THE PRESENCE OF, AS A CATALYST, AN OXIDE SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM OXIDE, THORIUM OXIDE, LITHIUM OXIDE,SCANDIUM OXIDE, YTTRIUM OXIDE, ALUMINA AND OXIDES OF RARE EARTH ELEMENTS OF LANTHANUM AND ATOMIC NUMBERS 58 - 71, SUBJECTING THE RESULTING OILY PRODUCT TO NEUTRALIZATION TREATMENT WITH AN AQUEOUS ALKALINE SOLUTION, AND REMOVING FROM THE PRODUCT THUS TREATED, FRACTIONS HAVING A BOILING POINT OF 150/100 MMHG OR LOWER, BY DISTILLATION.
Claim 2
Dependent Claim
132 words
A COMPOSITION USEFUL AS AN UNSULATING OIL OBTAINED BY HEATING NAPHTHENIC ACIDS ALONE OR A MIXTURE OF NAPHTHENIC ACIDS AND A SATURATED ALIPHATIC CARBOXYLIC ACID HAVING A CARBON NUMBER OF 2 TO 18 OR A SATURATED ALIPHATIC ALDEHYDE HAVING A CARBON NUMBER OF 2 TO 18, AT A TEMPERATURE OF 200* -700*C, UNDER A PRESSURE OF 0.1 - 10 ATM, AND IN THE PRESENCE OF, AS A CATALYST, AN OXIDE SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM OXIDE, THORIUM OXIDE, LITHIUM OXIDE,SCANDIUM OXIDE, YTTRIUM OXIDE, ALUMINA AND OXIDES OF RARE EARTH ELEMENTS OF LANTHANUM AND ATOMIC NUMBERS 58 - 71, SUBJECTING THE RESULTING OILY PRODUCT TO NEUTRALIZATION TREATMENT WITH AN AQUEOUS ALKALINE SOLUTION, AND REMOVING FROM THE PRODUCT THUS TREATED, FRACTIONS HAVING A BOILING POINT OF 150/100 MMHG OR LOWER, BY DISTILLATION.
Claim 3
Dependent Claim
56 words
A composition useful as an insulating oil according to claim 1, wherein, when said mixture is used as raw materials, the mixing ratio by mol of said saturated aliphatic carboxylic acid or aldehyde to said naphthenic acids is 5 or less based upon one mol of said naphthenic acids as calculated from the acid value thereof.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |