US2688643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing pour depressants
Assignee: Standard Oil Development Co
•
Filing: 1951-10-02
•
Granted: 1954-09-07
•
Expires: 1971-10-02
Abstract
No abstract record available.
Inventors
- 👤 Raymond M Dean
- 👤 Edward P Cashman
- 👤 John E Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:31
CPC Classifications
C; C10; C10M; C10M127/00; C10M127/06; C07; C07C; C07C2/00; C07C2/86; C07C2/861; C10M2203/00; C10M2203/06; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
AN IMPROVED PROCESS FOR THE PREPARATION OF ALKYLATED AROMATIC MATERIALS HAVING UTILITY AS POUR POINT DEPRESSANTS WHICH COMPRISES ALKYLATION OF AN AROMATIC HYDROCARBON WITH A HALOGENATED ALIPHATIC HYDROCARBON IN THE PRESENCE OF ABOUT 15 TO ABOUT 30 PARTS BY WEIGHT BASED ON 100 PARTS BY WEIGHT OF THE HALOGENATED ALIPHATIC HYDROCARBON OF A HYDROCARBON OIL HAVING A VISCOSITY AT 210* F. OF ABOUT 140 TO 200 S.U.S.
Claim 2
Dependent Claim
67 words
AN IMPROVED PROCESS FOR THE PREPARATION OF ALKYLATED AROMATIC MATERIALS HAVING UTILITY AS POUR POINT DEPRESSANTS WHICH COMPRISES ALKYLATION OF AN AROMATIC HYDROCARBON WITH A HALOGENATED ALIPHATIC HYDROCARBON IN THE PRESENCE OF ABOUT 15 TO ABOUT 30 PARTS BY WEIGHT BASED ON 100 PARTS BY WEIGHT OF THE HALOGENATED ALIPHATIC HYDROCARBON OF A HYDROCARBON OIL HAVING A VISCOSITY AT 210* F. OF ABOUT 140 TO 200 S.U.S.
References Cited (Backward Citations)
US1878963A
Cited
US2297292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |