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Patent US2673185A successfully refreshed from Google Patents.
US2673185A
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Polymerized carbonate ester lubricating oil additives
Assignee: Standard Oil Development Co
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Filing: 1951-02-15
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Granted: 1954-03-23
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Expires: 1971-02-15
Abstract
No abstract record available.
Inventors
- 👤 Jeffrey H Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:31
CPC Classifications
C; C10; C10M; C10M147/00; C10M147/04; C10M145/00; C10M145/02; C10M145/04; C10M2209/00; C10M2209/02; C10M2209/04; C10M2209/06; C10M2209/062; C10M2209/08; C10M2209/084; C10M2209/086; C10M2213/00; C10M2213/04; C10M2213/06; C10M2221/00; C10M2221/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A LUBRICATING COMPOSITION HAVING A DESIRABLY LOW POUR POINT WHICH CONSISTS ESSENTIALLY OF A MAJOR PROPORTION OF A WAXY MINERAL OIL CONTAINING COMBINED THEREIN A MINOR BUT POUR DEPRESSING AMOUNT OF A PRODUCT FORMED BY COPOLYMERIZING WITH VINYL ACETATE A MATERIAL HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
45 words
A LUBRICATING COMPOSITION HAVING A DESIRABLY LOW POUR POINT WHICH CONSISTS ESSENTIALLY OF A MAJOR PROPORTION OF A WAXY MINERAL OIL CONTAINING COMBINED THEREIN A MINOR BUT POUR DEPRESSING AMOUNT OF A PRODUCT FORMED BY COPOLYMERIZING WITH VINYL ACETATE A MATERIAL HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
US2563609A
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US2406549A
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US2377111A
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US2441023A
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US2595214A
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US2542542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |