Patent US2992987A successfully refreshed from Google Patents.
US2992987A
Expired / Lapsed
US
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Lubricating oil additive concentrate
Assignee: Monsanto Chemicals Ltd
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Filing: 1958-06-26
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Granted: 1961-07-18
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Expires: 1978-06-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Fields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:41
CPC Classifications
C; C10; C10M; C10M157/00; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/086; C10M2217/00; C10M2217/02; C10M2217/022; C10M2217/023; C10M2217/024; C10M2217/06; C10N; C10N2040/00; C10N2040/08; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A COMPATIBLE LUBRICATING OIL ADDITIVE CONCENTRATE CONSISTING ESSENTIALLY OF A MAJOR AMOUNT OF A MINERAL OIL BASE STOCK AND A MINOR AMOUNT IN THE RANGE OF ABOUT 15% TO ABOUT 50% BY WEIGHT OF AN ADDITIVE MIXTURE HAVING AS A VISCOSITY INDEX IMPROVER A POLYMER OF ACRYLIC ACID HAVING A MOLECULAR WEIGHT IN THE RANGE OF ABOUT 15,000 TO ABOUT 100,000 AND ETERIFIED WITH A SATURATED ALIPHATIC HYDROCARBON ALCOHOL HAVING AT LEAST 8 AND NOT MORE THAN ABOUT 18 CARBON ATOMS PER MOLECULE AND AN ETHYLENE-MALEIC ANHYDRIDE COPOLYMER HAVING A SPECIFIC VISCOSITY IN THE RANGE OF ABOUT 0.05 TO ABOUT 1.0 AS DETERMINED IN 1% BY WEIGHT SOLUTION OF THE COPOLYMER IN DIMETHYLFORMAMIDE AT 25*C. AND ESTERIFIED TO AT LEAST 50% WITH SATURATED ALIPHATIC HYDROCARBON ALCOHOL HAVING FROM ABOUT 10 TO ABOUT 20 CARBON ATOMS PER MOLECULE, AND THE RATIO OF THE COPOLYMER ESTER TO THE VISCOSITY INDEX IMPROVER POLYMER BEING NOT MORE THAN ABOUT 15 TO 20 PARTS BY WEIGHT OF THE COPOLYMER ESTER PER 100 PARTS BY WEIGHT OF THE VISCOSITY INDEX IMPROVER POLYMER.
Claim 2
Dependent Claim
176 words
A COMPATIBLE LUBRICATING OIL ADDITIVE CONCENTRATE CONSISTING ESSENTIALLY OF A MAJOR AMOUNT OF A MINERAL OIL BASE STOCK AND A MINOR AMOUNT IN THE RANGE OF ABOUT 15% TO ABOUT 50% BY WEIGHT OF AN ADDITIVE MIXTURE HAVING AS A VISCOSITY INDEX IMPROVER A POLYMER OF ACRYLIC ACID HAVING A MOLECULAR WEIGHT IN THE RANGE OF ABOUT 15,000 TO ABOUT 100,000 AND ETERIFIED WITH A SATURATED ALIPHATIC HYDROCARBON ALCOHOL HAVING AT LEAST 8 AND NOT MORE THAN ABOUT 18 CARBON ATOMS PER MOLECULE AND AN ETHYLENE-MALEIC ANHYDRIDE COPOLYMER HAVING A SPECIFIC VISCOSITY IN THE RANGE OF ABOUT 0.05 TO ABOUT 1.0 AS DETERMINED IN 1% BY WEIGHT SOLUTION OF THE COPOLYMER IN DIMETHYLFORMAMIDE AT 25*C. AND ESTERIFIED TO AT LEAST 50% WITH SATURATED ALIPHATIC HYDROCARBON ALCOHOL HAVING FROM ABOUT 10 TO ABOUT 20 CARBON ATOMS PER MOLECULE, AND THE RATIO OF THE COPOLYMER ESTER TO THE VISCOSITY INDEX IMPROVER POLYMER BEING NOT MORE THAN ABOUT 15 TO 20 PARTS BY WEIGHT OF THE COPOLYMER ESTER PER 100 PARTS BY WEIGHT OF THE VISCOSITY INDEX IMPROVER POLYMER.
References Cited (Backward Citations)
US2091627A
Cited
US2616854A
Cited
US2492789A
Cited
US2615845A
Cited
US2655479A
Cited
US2600451A
Cited
US2710842A
Cited
US2849398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |