US2746925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricants and additives therefor
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1951-09-27
•
Granted: 1956-05-22
•
Expires: 1971-09-27
Abstract
No abstract record available.
Inventors
- 👤 John D Garber
- 👤 Jr William C Hollyday
- 👤 Byron M Vanderbilt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:05
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2205/00; C10M2205/06; C10M2205/22; C10M2211/00; C10M2211/02; C10M2211/06; C10M2211/08; C10M2213/00; C10M2213/02; C10M2213/06; C10M2213/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN A PROCESS FOR THE FORMATION OF COPOLYMERS HAVING THE DESIRABLE CHARACTERISTIC OF LOWERING THE POUR POINT AND INCREASING THE VISCOSITY INDEX OF MINERAL LUBRICATING OILS WITH WHICH THEY ARE BLENDED WHEREIN FROM 75% TO 25% OF A MONO-OLEFIN CONTAINING FROM 8 TO 20 CARBON ATOMS IN A STRAIGHT CHAIN IS COPOLYMERIZED WITH FROM 25% TO 75% OF AN OLEFIN OF SUBSTANTIALLY LOWER MOLECULAR WEIGHT CONTAINING FROM 2 TO 6 CARBON ATOMS, IN THE PRESENCE OF AN INERT SOLVENT ACTING AS A REFRIGERANT IN THE PROCESS AND A FRIEDEL-CRAFTS CATALYST AT A TEMPERATURE WITHIN THE RANGE FROM -105* C. TO 0* C. TO FORM A COPOLYMER HAVING A MOLECULAR WEIGHT WITHIN THE RANGE OF FROM 3,000 TO 6,000, THE IMPROVEMENT WHICH COMPRISES MIXING A SOLUTION OF THE FRIEDEL-CRAFTS CATALYST IN INERT SOLVENT WITH THE MONOOLEFIN CONTAINING FROM 8 TO 20 CARBON ATOMS IN A STRAIGHT CHAIN, AND THEREAFTER ADDING TO THE RESULTANT MIXTURE THE LOWER MOLECULAR WEIGHT OLEFIN CONTAINING 2 TO 6 CARBON ATOMS.
Claim 2
Dependent Claim
164 words
IN A PROCESS FOR THE FORMATION OF COPOLYMERS HAVING THE DESIRABLE CHARACTERISTIC OF LOWERING THE POUR POINT AND INCREASING THE VISCOSITY INDEX OF MINERAL LUBRICATING OILS WITH WHICH THEY ARE BLENDED WHEREIN FROM 75% TO 25% OF A MONO-OLEFIN CONTAINING FROM 8 TO 20 CARBON ATOMS IN A STRAIGHT CHAIN IS COPOLYMERIZED WITH FROM 25% TO 75% OF AN OLEFIN OF SUBSTANTIALLY LOWER MOLECULAR WEIGHT CONTAINING FROM 2 TO 6 CARBON ATOMS, IN THE PRESENCE OF AN INERT SOLVENT ACTING AS A REFRIGERANT IN THE PROCESS AND A FRIEDEL-CRAFTS CATALYST AT A TEMPERATURE WITHIN THE RANGE FROM -105* C. TO 0* C. TO FORM A COPOLYMER HAVING A MOLECULAR WEIGHT WITHIN THE RANGE OF FROM 3,000 TO 6,000, THE IMPROVEMENT WHICH COMPRISES MIXING A SOLUTION OF THE FRIEDEL-CRAFTS CATALYST IN INERT SOLVENT WITH THE MONOOLEFIN CONTAINING FROM 8 TO 20 CARBON ATOMS IN A STRAIGHT CHAIN, AND THEREAFTER ADDING TO THE RESULTANT MIXTURE THE LOWER MOLECULAR WEIGHT OLEFIN CONTAINING 2 TO 6 CARBON ATOMS.
References Cited (Backward Citations)
US2220307A
Cited
US2273158A
Cited
US2379728A
Cited
US2401933A
Cited
US2474670A
Cited
US2525787A
Cited
US2534095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |