US2575992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric lubricating oil additives
Assignee: Standard Oil Development Co
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Filing: 1948-09-30
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Granted: 1951-11-20
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Expires: 1968-09-30
Abstract
No abstract record available.
Inventors
- 👤 Jeffrey H Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:06
CPC Classifications
C; C10; C10M; C10M145/00; C10M145/02; C10M145/10; C10M145/16; C08; C08F; C08F22/00; C08F22/10; C08F22/12; C08F22/14; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/086; C10M2213/00; C10M2213/04; C10M2213/06; C10N; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A COMPOSITION CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF A WAXY MINERAL LUBRICATING OIL AND A SMALL AMOUNT, SUFFICIENT TO DEPRESS THE POUR POINT THEREOF, OF A COPOLYMER OF ABOUT FOUR PARTS BY WEIGHT OF A TRI-ESTER OF ACONITIC ACID WHEREIN AT LEAST ONE ESTER GROUP CONTAINS FROM 8 TO 18 SATURATED CARBON ATOMS AND ABOUT ONE PART BY WEIGHT OF VINYL ACETATE, SAID COPOLYMER HAVING A MOLECULAR WEIGHT OF FROM 1,000 TO 50,000.
Claim 2
Dependent Claim
74 words
A COMPOSITION CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF A WAXY MINERAL LUBRICATING OIL AND A SMALL AMOUNT, SUFFICIENT TO DEPRESS THE POUR POINT THEREOF, OF A COPOLYMER OF ABOUT FOUR PARTS BY WEIGHT OF A TRI-ESTER OF ACONITIC ACID WHEREIN AT LEAST ONE ESTER GROUP CONTAINS FROM 8 TO 18 SATURATED CARBON ATOMS AND ABOUT ONE PART BY WEIGHT OF VINYL ACETATE, SAID COPOLYMER HAVING A MOLECULAR WEIGHT OF FROM 1,000 TO 50,000.
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) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |