Patent CA594801A successfully refreshed from Google Patents.
US3192153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of transformer oils
Assignee: ExxonMobil Oil Corp
•
Filing: 1962-11-06
•
Granted: 1965-06-29
•
Expires: 1982-11-06
Abstract
No abstract record available.
Inventors
- 👤 Michael T Smilski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:49
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/44; C10G2400/00; C10G2400/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD FOR PRODUCING A TRANSFORMER OIL OF SUPERIOR OXIDATION RESISTANCE AND SLUDGE FORMING CHARACTERISTICS WHICH COMPRISES EMPLOYING AS A HYDROCARBON FEED, A STRAIGHT-RUN NAPHTHENIC HYDROCARBON OIL DISTILLATE FRACTION HAVING A SULFUR CONTENT BELOW ABOUT 1 WEIGHT PERCENT AND A POUR POINT BELOW ABOUT - 50*F., AND SUBJECTING SAID NAPHTHENIC FEED TO RELATIVELY SEVERE CATALYTIC HYDROGENATING CONDITIONS INCLUDING A PRESSURE ABOVE ABOUT 2000 P.S.I.G. AND A TEMPERATURE IN THE RANGE OF FROM ABOUT 600 TO ABOUT 750*F. TO PRODUCE SAID TRANSFORMER OIL.
Claim 2
Independent Claim
82 words
A METHOD FOR PRODUCING A TRANSFORMER OIL OF SUPERIOR OXIDATION RESISTANCE AND SLUDGE FORMING CHARACTERISTICS WHICH COMPRISES EMPLOYING AS A HYDROCARBON FEED, A STRAIGHT-RUN NAPHTHENIC HYDROCARBON OIL DISTILLATE FRACTION HAVING A SULFUR CONTENT BELOW ABOUT 1 WEIGHT PERCENT AND A POUR POINT BELOW ABOUT - 50*F., AND SUBJECTING SAID NAPHTHENIC FEED TO RELATIVELY SEVERE CATALYTIC HYDROGENATING CONDITIONS INCLUDING A PRESSURE ABOVE ABOUT 2000 P.S.I.G. AND A TEMPERATURE IN THE RANGE OF FROM ABOUT 600 TO ABOUT 750*F. TO PRODUCE SAID TRANSFORMER OIL.
References Cited (Backward Citations)
US2554282A
Cited
US2904505A
Cited
US2963426A
Cited
US2921025A
Cited
US3020228A
Cited
US2985586A
Cited
US3000807A
Cited
US3012963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-28 | 1968-12-28 | 1969-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-28 | 1972-12-28 | 1973-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-28 | 1976-12-28 | 1977-06-29 | $7700.00 | Window Closed / Lapsed |