US2800500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of synthetic lubricants in the presence of phenothiazine
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1953-10-30
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Granted: 1957-07-23
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Expires: 1973-10-30
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Matuszak
- 👤 Walter W Gleason
- 👤 David W Young
- 👤 Delmer L Cottle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:45
CPC Classifications
C; C10; C10M; C10M3/00; C07; C07C; C07C67/00; C07C67/08; C10M2207/00; C10M2207/28; C10M2207/282; C10M2207/30; C10M2207/302; C10M2207/304; C10M2207/34; C10M2209/00; C10M2209/10; C10M2209/11; C10M2209/111; C10M2209/112; C10M2219/00; C10M2219/10; C10M2219/104; C10M2219/108; C10M2221/00; C10M2221/04; C10M2221/043; C10N; C10N2030/00; C10N2030/08; C10N2040/00; C10N2040/12; C10N2040/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
IN A PROCESS FOR THE PREPARATION OF COMPLEX ESTER SYNTHETIC LUBRICANTS FROM BRANCHED CHAIN ALCOHOLS, GLYCOLS, AND DICARBOXYLIC ACID IN THE PRESENCE OF AN ESTERIFICATION CATALYST, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE ESTERFICATION REACTION IN THE PRESENCE OF FROM ABOUT 0.05% TO ABOUT 2.0% BY WEIGHT OF PHENOTHIAZINE.
Claim 2
Dependent Claim
49 words
IN A PROCESS FOR THE PREPARATION OF COMPLEX ESTER SYNTHETIC LUBRICANTS FROM BRANCHED CHAIN ALCOHOLS, GLYCOLS, AND DICARBOXYLIC ACID IN THE PRESENCE OF AN ESTERIFICATION CATALYST, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE ESTERFICATION REACTION IN THE PRESENCE OF FROM ABOUT 0.05% TO ABOUT 2.0% BY WEIGHT OF PHENOTHIAZINE.
References Cited (Backward Citations)
US2609343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |