US2529316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for acylating butadienestyrene copolymers
Assignee: Standard Oil Development Co
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Filing: 1947-04-02
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Granted: 1950-11-07
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Expires: 1967-04-02
Abstract
No abstract record available.
Inventors
- 👤 William H Smyers
- 👤 Edward P Cashman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:25
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C08; C08C; C08C19/00; C10M2209/00; C10M2209/10; C10M2213/00; C10M2213/04; C10M2213/06; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/06; C10M2221/00; C10M2221/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS OF PREPARING A SUITABLE POUR POINT DEPRESSING COMPOSITION FOR USE IN LOWERING THE POUR POINT OF WAXY MINERAL BASE LUBRICATING OILS WHICH COMPRISES REACTING ABOUT ONE PART BY WEIGHT OF A SOLID RUBBERY COPOLYMER OF FROM 60% TO 80% BY WEIGHT OF BUTADIENE AND FROM 20% TO 40% BY WEIGHT OF STYRENE, WHICH COPOLYMER HAS AN IODINE NUMBER OF A LEAST 200, WITH FROM ONE TO 5 PARTS BY WEIGHT OF STEARYL CHLORIDE IN THE PRESENCE OF A SOLVENT INERT TO THE COPOLYMER AND FROM 0.5 TO 3 PARTS BY WEIGHT OF A FRIEDEL-CRAFTS CATALYST AT A TEMPERATURE WITHIN THE RANGE OF FROM 125* TO 250*F. FOR A PERIOD OF TIME OF FROM 1/2 TO 10 HOURS AND UNTIL THE IODINE NUMBER OF THE RESULTING COMPOSITION IS LESS THAN 100.
Claim 2
Dependent Claim
132 words
A PROCESS OF PREPARING A SUITABLE POUR POINT DEPRESSING COMPOSITION FOR USE IN LOWERING THE POUR POINT OF WAXY MINERAL BASE LUBRICATING OILS WHICH COMPRISES REACTING ABOUT ONE PART BY WEIGHT OF A SOLID RUBBERY COPOLYMER OF FROM 60% TO 80% BY WEIGHT OF BUTADIENE AND FROM 20% TO 40% BY WEIGHT OF STYRENE, WHICH COPOLYMER HAS AN IODINE NUMBER OF A LEAST 200, WITH FROM ONE TO 5 PARTS BY WEIGHT OF STEARYL CHLORIDE IN THE PRESENCE OF A SOLVENT INERT TO THE COPOLYMER AND FROM 0.5 TO 3 PARTS BY WEIGHT OF A FRIEDEL-CRAFTS CATALYST AT A TEMPERATURE WITHIN THE RANGE OF FROM 125* TO 250*F. FOR A PERIOD OF TIME OF FROM 1/2 TO 10 HOURS AND UNTIL THE IODINE NUMBER OF THE RESULTING COMPOSITION IS LESS THAN 100.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |