US2615845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating oil additives
Assignee: Standard Oil Development Co
•
Filing: 1948-08-02
•
Granted: 1952-10-28
•
Expires: 1968-08-02
Abstract
No abstract record available.
Inventors
- 👤 Samuel B Lippincott
- 👤 Louis A Mikeska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:19
CPC Classifications
C; C10; C10M; C10M149/00; C10M149/02; C10M149/06; C08; C08F; C08F22/00; C08F22/04; C10M145/00; C10M145/02; C10M145/10; C10M145/16; C10M2205/00; C10M2205/02; C10M2205/026; C10M2205/22; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/086; C10M2209/10; C10M2209/101; C10M2213/00; C10M2213/04; C10M2213/06; C10M2217/00; C10M2217/02; C10M2217/024; C10M2217/06; C10M2221/00; C10M2221/02; C10N; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A MINERAL LUBRICATING OIL CONTAINING A MINOR PROPORTION SUFFICIENT TO INCREASE THE VISCOSITY INDEX AND LOWER THE POUR POINT OF SAID OIL, OF A RELATIVELY HIGH MOLECULAR WEIGHT COPOLYMER REACTION PRODUCT FORMED BY REACTING SUBSTANTAILLY EQUIMOLAR PROPORTIONS OF MALEIC ANHYDRIDE AND A STRAIGHT CHAIN 1-OLEFIN HAVING UP TO 20 CARBON ATOMS IN THE PRESENCE OF A PEROXIDE TYPE CATALYST AND THEREAFTER ESTERIFYING THE COPOLYMER WITH A MIXTURE OF SATURATED STRAIGHT CHAIN ALCOHOLS RANGING FROM 10 TO 18 CARBON ATOMS, BUT HAVING A MAJOR PROPORTION OF LAURYL ALCOHOL.
Claim 2
Dependent Claim
87 words
A MINERAL LUBRICATING OIL CONTAINING A MINOR PROPORTION SUFFICIENT TO INCREASE THE VISCOSITY INDEX AND LOWER THE POUR POINT OF SAID OIL, OF A RELATIVELY HIGH MOLECULAR WEIGHT COPOLYMER REACTION PRODUCT FORMED BY REACTING SUBSTANTAILLY EQUIMOLAR PROPORTIONS OF MALEIC ANHYDRIDE AND A STRAIGHT CHAIN 1-OLEFIN HAVING UP TO 20 CARBON ATOMS IN THE PRESENCE OF A PEROXIDE TYPE CATALYST AND THEREAFTER ESTERIFYING THE COPOLYMER WITH A MIXTURE OF SATURATED STRAIGHT CHAIN ALCOHOLS RANGING FROM 10 TO 18 CARBON ATOMS, BUT HAVING A MAJOR PROPORTION OF LAURYL ALCOHOL.
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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) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |