US2671760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating oil compositions
Assignee: Individual
•
Filing: 1951-05-18
•
Granted: 1954-03-09
•
Expires: 1971-05-18
Abstract
No abstract record available.
Inventors
- 👤 William S Port
- 👤 Swern Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:15
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2209/00; C10M2209/02; C10M2209/04; C10M2209/06; C10M2209/062; C10M2209/08; C10M2209/082
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A LUBRICATING OIL COMPOSITION HAVING AN IMPROVED VISCOSITY INDEX COMPRISING A LUBRICATING OIL HAVING INCORPORATED THEREIN A LINEAR HETEROPOLYMER HAVING A MOLECULAR WEIGHT OF ABOUT FROM 5,000 TO 100,000 AND HAVING BEEN PREPARED BY POLYMERIZING A MIXTURE CONTAINING, AS POLYMERIZABLE COMPONENTS, MONOMERIC VINYL ACETATE AND MONOMERIC VINYL PALMITATE.
Claim 2
Dependent Claim
48 words
A LUBRICATING OIL COMPOSITION HAVING AN IMPROVED VISCOSITY INDEX COMPRISING A LUBRICATING OIL HAVING INCORPORATED THEREIN A LINEAR HETEROPOLYMER HAVING A MOLECULAR WEIGHT OF ABOUT FROM 5,000 TO 100,000 AND HAVING BEEN PREPARED BY POLYMERIZING A MIXTURE CONTAINING, AS POLYMERIZABLE COMPONENTS, MONOMERIC VINYL ACETATE AND MONOMERIC VINYL PALMITATE.
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) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |