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Patent US2528092A successfully refreshed from Google Patents.
US2528092A
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Antioxidants for mineral oil lubricants and compositions containing the same
Assignee: Gulf Oil Corp
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Filing: 1949-10-17
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Granted: 1950-10-31
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Expires: 1969-10-17
Abstract
No abstract record available.
Inventors
- 👤 Herschel G Smith
- 👤 Troy L Cantrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:41
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2219/00; C10M2219/10; C10M2219/102; C10M2219/104; C10M2219/106; C10N; C10N2040/00; C10N2040/135; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
65 words
THE PROCESS OF PREPARING AN ADDITION AGENT FOR MINERAL OIL LUBRICANTS WHICH COMPRISES HEATING PHENOTHIAZINE WITH FROM 4 TO 9 MOLS OF NDIMETHYLANILINE AND 4 TO 9 MOLS OF FORMALDEHYDE PER MOL OF PHENOTHIAZINE IN THE PRESENCE OF AN ACTIVATED CLAY CATALYST AT A TEMPERATURE NOT IN EXCESS FO 350*F. TO CONDENSE TOGETHER THE THREE REACTANTS, RECOVERING THE CONDENSATION PRODUCT AND NEUTRALIZING IT WITH CYCLOHEXYLAMINE.
Claim 2
Dependent Claim
65 words
THE PROCESS OF PREPARING AN ADDITION AGENT FOR MINERAL OIL LUBRICANTS WHICH COMPRISES HEATING PHENOTHIAZINE WITH FROM 4 TO 9 MOLS OF NDIMETHYLANILINE AND 4 TO 9 MOLS OF FORMALDEHYDE PER MOL OF PHENOTHIAZINE IN THE PRESENCE OF AN ACTIVATED CLAY CATALYST AT A TEMPERATURE NOT IN EXCESS FO 350*F. TO CONDENSE TOGETHER THE THREE REACTANTS, RECOVERING THE CONDENSATION PRODUCT AND NEUTRALIZING IT WITH CYCLOHEXYLAMINE.
Claim 3
Dependent Claim
68 words
A LUBRICANT COMPOSITION COMPRISING A MAJOR AMOUNT OF A MINERAL LUBRICATING OIL, AND A MINOR AMOUNT, SUFFICIENT TO INHIBIT THE OXIDATIVE DETERIORATION OF SAID OIL OF A NON-RESINOUS CONDENSATION PRODUCT OF PHENOTHIAZINE WITH FROM 4 TO 9 MOLS OF OF N-DIMETHYLANILINE AND 4 TO 9 MOLS OF FORMALDEHYDE PER MOL OF PHENOTHIAZINE, SAID PRODUCT HAVING BEEN NEUTRALIZED WITH CYCLOHEXYLAMINE AND BEING OBTAINED BY THE PROCESS OF CLAIM 1.
References Cited (Backward Citations)
US2263013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |