Patent US2994663A successfully refreshed from Google Patents.
US2994663A
Expired / Lapsed
US
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Lubricant containing copolymer viscosity index improver
Assignee: California Research LLC
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Filing: 1959-08-10
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Granted: 1961-08-01
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Expires: 1979-08-10
Abstract
No abstract record available.
Inventors
- 👤 Lowe Warren
- 👤 Frank A Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:53
CPC Classifications
C; C10; C10M; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C08; C08F; C08F16/00; C08F16/12; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/16; C08F220/18; C08F220/1808; C10M2203/00; C10M2203/06; C10M2205/00; C10M2205/14; C10M2205/16; C10M2205/17; C10M2205/22; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/027; C10M2207/28; C10M2207/282; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/108; C10M2219/00; C10M2219/04; C10M2219/044; C10M2219/046; C10M2219/08; C10M2219/082; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/045; C10M2223/12; C10M2225/00; C10M2225/04; C10M2227/00; C10M2227/02; C10M2229/00; C10M2229/04; C10M2229/045; C10M2229/046; C10M2229/047; C10M2229/048; C10N; C10N2010/00; C10N2010/04; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A LUBRICANT COMPOSITION COMPRISING A MAJOR PROPORTION OF AN OIL OF LUBRICATING VISCOSITY AND A MINOR PROPORTION SUFFICIENT TO IMPROVE THE VISCOSITY INDEX OF SAID OIL OF THE COPOLYMER OF (A) VINYL ALKYL ETHER HAVING FROM 2 TO 6 CARBON ATOMS IN THE ALKYL GROUP AND (B) AT LEAST ONE ESTER OF THE CLASS CONSISTING OF ALKYL ACRYLATES AND ALKYL METHACRYLATES HAVING FROM 4 TO 12 CARBON ATOMS IN EACH OF THE ALKYL GROUPS, THE TOTAL OF CARBON ATOMS IN THE ALKYL GROUP OF THE (A) AND THE AVERAGE ALKYL GROUP OF THE (B) MONOMERS BEING FROM ABOUT 8 TO ABOUT 12, THE MOL RATIO FO (A) TO (B) BEING APPROXIMATELY 1:1 AND THE MOLECULAR WEIGHT OF THE COPOLYMER BEING AT LEAST ABOUT 50,000.
Claim 2
Dependent Claim
124 words
A LUBRICANT COMPOSITION COMPRISING A MAJOR PROPORTION OF AN OIL OF LUBRICATING VISCOSITY AND A MINOR PROPORTION SUFFICIENT TO IMPROVE THE VISCOSITY INDEX OF SAID OIL OF THE COPOLYMER OF (A) VINYL ALKYL ETHER HAVING FROM 2 TO 6 CARBON ATOMS IN THE ALKYL GROUP AND (B) AT LEAST ONE ESTER OF THE CLASS CONSISTING OF ALKYL ACRYLATES AND ALKYL METHACRYLATES HAVING FROM 4 TO 12 CARBON ATOMS IN EACH OF THE ALKYL GROUPS, THE TOTAL OF CARBON ATOMS IN THE ALKYL GROUP OF THE (A) AND THE AVERAGE ALKYL GROUP OF THE (B) MONOMERS BEING FROM ABOUT 8 TO ABOUT 12, THE MOL RATIO FO (A) TO (B) BEING APPROXIMATELY 1:1 AND THE MOLECULAR WEIGHT OF THE COPOLYMER BEING AT LEAST ABOUT 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) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |