Patent EP0217537A1 successfully refreshed from Google Patents.
US2637698A
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Mineral oil lubricating composition containing a copolymer of an alkyl ester of itaconic acid and an alkyl acrylate or methacrylate
Assignee: Standard Oil Development Co
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Filing: 1948-12-30
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Granted: 1953-05-05
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Expires: 1968-12-30
Abstract
No abstract record available.
Inventors
- 👤 Tutwiler Thomas Stanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:37
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/086; C10M2209/10; C10M2209/103; C10M2209/109; C10M2213/00; C10M2213/04; C10M2213/06; C10M2217/00; C10M2217/02; C10M2217/04; C10N; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A LUBRICATING OIL COMPOSITION CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF A MINERAL OIL BASE STOCK AND A SMALL BUT VISCOSITY INDEX IMPROVING AMOUNT OF A COPOLYMER OF AN ALKYL ESTER OF ITACONIC ACID WHEREIN THE ESTERIFYING GROUP CONTAINS FROM 1 TO 4 CARBON ATOMS AND A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
51 words
A LUBRICATING OIL COMPOSITION CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF A MINERAL OIL BASE STOCK AND A SMALL BUT VISCOSITY INDEX IMPROVING AMOUNT OF A COPOLYMER OF AN ALKYL ESTER OF ITACONIC ACID WHEREIN THE ESTERIFYING GROUP CONTAINS FROM 1 TO 4 CARBON ATOMS AND A COMPOUND HAVING THE FORMULA
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |