Patent US3245211A successfully refreshed from Google Patents.
Patent US2616849A successfully refreshed from Google Patents.
US2616849A
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Copolymers of maleic anhydride with esters of itaconic acid and salts thereof as viscosity index improvers and pour point depressants
Assignee: ExxonMobil Oil Corp
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Filing: 1949-05-11
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Granted: 1952-11-04
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Expires: 1969-05-11
Abstract
No abstract record available.
Inventors
- 👤 John J Giammaria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:43
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C08; C08F; C08F22/00; C08F22/04; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/086; C10N; C10N2010/00; C10N2010/02; C10N2010/04; C10N2010/06; C10N2010/08; C10N2010/10; C10N2010/12; C10N2010/14; C10N2010/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A MINERAL LUBRICATING OIL CONTAINING FROM ABOUT 0.01% TO ABOUT 50% OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A COPOLYMER PRODUCED BY COPOLYMERIZING MALEIC ANHYDRIDE WITH A DIESTER OF ITACONIC ACID, SAID DIESTER HAVING BEEN OBTAINED BY ESTERIFYING ITACONIC ACID WITH A PRIMARY, NORMAL, ALIPHATIC ALCOHOL HAVING FROM 1 TO 18 CARBON ATOMS, AND A METAL SALT OF SAID COPOLYMER.
Claim 2
Dependent Claim
62 words
A MINERAL LUBRICATING OIL CONTAINING FROM ABOUT 0.01% TO ABOUT 50% OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A COPOLYMER PRODUCED BY COPOLYMERIZING MALEIC ANHYDRIDE WITH A DIESTER OF ITACONIC ACID, SAID DIESTER HAVING BEEN OBTAINED BY ESTERIFYING ITACONIC ACID WITH A PRIMARY, NORMAL, ALIPHATIC ALCOHOL HAVING FROM 1 TO 18 CARBON ATOMS, AND A METAL SALT OF SAID COPOLYMER.
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) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |