US2655549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of lubricating oil additives
Assignee: Standard Oil Development Co
•
Filing: 1950-08-30
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Granted: 1953-10-13
•
Expires: 1970-08-30
Abstract
No abstract record available.
Inventors
- 👤 Welch Lester Marshall
- 👤 George E Serniuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:18
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2205/00; C10M2205/04; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/06; C10N; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
AN IMPROVED PROCESS FOR THE MANUFACTURE OF A LUBRICATING OIL ADDITIVE MATERIAL HAVING THE DESIRABLE CHARACTERISTIC OF DEPRESSING THE POUR POINT OF LUBRICATING OILS INTO WHICH IT IS INCORPORATED WHICH COMPRISES ADMIXING SUBSTANTIALLY EQUIMOLAR PROPORTIONS OF A VINYL AROMATIC AND A HALO-ALKANE ALKYLATING AGENT IN A POLAR SOLVENT, ADDING THERETO A COMPLEX OBTAINED BY ADMIXING A FRIEDEL-CRAFTS CATALYST WITH A MATERIAL SELECTED FROM THE CLASS CONSISTING OF NITROMETHANE AND NITROBENZENE, MAINTAINING THE TEMPERATURE OF THE MIXTURE AT ONE WITHIN THE RANGE OF FROM -20* C. TO 50* C. FOR A PERIOD OF TIME SUFFICIENT TO POLYMERIZE SUBSTANTIALLY ALL OF THE VINYL AROMATIC, AND THEREAFTER RAISING THE REACTION TEMPERATURE TO ONE WITHIN A RANGE OF FROM 60* C. TO 100* C. TO OBTAIN THE DESIRED FINAL PRODUCT.
Claim 2
Dependent Claim
126 words
AN IMPROVED PROCESS FOR THE MANUFACTURE OF A LUBRICATING OIL ADDITIVE MATERIAL HAVING THE DESIRABLE CHARACTERISTIC OF DEPRESSING THE POUR POINT OF LUBRICATING OILS INTO WHICH IT IS INCORPORATED WHICH COMPRISES ADMIXING SUBSTANTIALLY EQUIMOLAR PROPORTIONS OF A VINYL AROMATIC AND A HALO-ALKANE ALKYLATING AGENT IN A POLAR SOLVENT, ADDING THERETO A COMPLEX OBTAINED BY ADMIXING A FRIEDEL-CRAFTS CATALYST WITH A MATERIAL SELECTED FROM THE CLASS CONSISTING OF NITROMETHANE AND NITROBENZENE, MAINTAINING THE TEMPERATURE OF THE MIXTURE AT ONE WITHIN THE RANGE OF FROM -20* C. TO 50* C. FOR A PERIOD OF TIME SUFFICIENT TO POLYMERIZE SUBSTANTIALLY ALL OF THE VINYL AROMATIC, AND THEREAFTER RAISING THE REACTION TEMPERATURE TO ONE WITHIN A RANGE OF FROM 60* C. TO 100* C. TO OBTAIN THE DESIRED FINAL PRODUCT.
References Cited (Backward Citations)
US2076201A
Cited
US2072120A
Cited
US2209462A
Cited
US2282456A
Cited
US2485454A
Cited
GB640567A
Cited
US2569400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |