US2841553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating oil additive
Assignee: Standard Oil Co
•
Filing: 1956-12-24
•
Granted: 1958-07-01
•
Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 Samuel M Darling
- 👤 Liao Chien-Wei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:40
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4015
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A MINERAL LUBRICATING OIL CONTAINING AN AMOUNT TO IMPROVE THE DISPERSANCY AND VISCOSITY INDEX OF THE OIL WITHIN THE RANGE FROM 0.1 TO 5% BY WEIGHT OF THE OIL OF A LUBRICATING OIL ADDITIVE HAVING THE STRUCTURE:
Claim 2
Dependent Claim
37 words
A MINERAL LUBRICATING OIL CONTAINING AN AMOUNT TO IMPROVE THE DISPERSANCY AND VISCOSITY INDEX OF THE OIL WITHIN THE RANGE FROM 0.1 TO 5% BY WEIGHT OF THE OIL OF A LUBRICATING OIL ADDITIVE HAVING THE STRUCTURE:
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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |