US2672448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer oil containing a tertiary alkyl phenol antioxidant and a dihydroxy anthraquinone as a synergist for the antioxidant
Assignee: California Research LLC
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Filing: 1952-09-27
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Granted: 1954-03-16
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Expires: 1972-09-27
Abstract
No abstract record available.
Inventors
- 👤 Charles D Newnan
- 👤 Neal W Furby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:28
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2205/00; C10M2205/02; C10M2205/024; C10M2205/026; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/025; C10M2207/026; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/34; C10M2209/00; C10M2209/10; C10M2209/102; C10M2209/103; C10M2209/105; C10M2209/108; C10M2209/109; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/06; C10M2223/065; C10N; C10N2040/00; C10N2040/02; C10N2040/06; C10N2040/14; C10N2040/16; C10N2040/17; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50; C10N2050/00; C10N2050/10; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A TRANSFORMER OIL CONSISTING ESSENTIALLY OF A MAJOR PORTION OF A LUBRICATING OIL AND A MINOR PORTION OF A COMBINATION OF A TERTIARY ALKYL PHENOL ANTIOXIDANT, FOR SAID LUBRICATING OIL AND A SYNERGIST FOR SAID ANTIOXIDANT, SAID ANTIOXIDANT BEING PRESENT IN AN AMOUNT SUFFICIENT TO INCREASE THE RESISTANCE OF SAID OIL TO OXIDATION, SAID SYNERGIST BEING A HYDROXY ANTHRAQUINONE SELECTED FROM THE GROUP CONSISTING OF ALIZARIN, QUINIZARIN, ANTHRARUFIN, CHRYSAZIN, AND 2-EMTHYL-1,4-DIHYDROXY ANTHRAQUINONE, SAID SYNERGIST BEING PRESENT IN THE PROPORTION OF ABOUT 0.002% TO ABOUT 1.0% BY WEIGHT OF SAID TRANSFORMER OIL.
Claim 2
Dependent Claim
91 words
A TRANSFORMER OIL CONSISTING ESSENTIALLY OF A MAJOR PORTION OF A LUBRICATING OIL AND A MINOR PORTION OF A COMBINATION OF A TERTIARY ALKYL PHENOL ANTIOXIDANT, FOR SAID LUBRICATING OIL AND A SYNERGIST FOR SAID ANTIOXIDANT, SAID ANTIOXIDANT BEING PRESENT IN AN AMOUNT SUFFICIENT TO INCREASE THE RESISTANCE OF SAID OIL TO OXIDATION, SAID SYNERGIST BEING A HYDROXY ANTHRAQUINONE SELECTED FROM THE GROUP CONSISTING OF ALIZARIN, QUINIZARIN, ANTHRARUFIN, CHRYSAZIN, AND 2-EMTHYL-1,4-DIHYDROXY ANTHRAQUINONE, SAID SYNERGIST BEING PRESENT IN THE PROPORTION OF ABOUT 0.002% TO ABOUT 1.0% BY WEIGHT OF SAID TRANSFORMER OIL.
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) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |