US2771494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective solvent extraction of naphthene hydrocarbons employing 2-pyrrolidone
Assignee: Phillips Petroleum Co
•
Filing: 1953-03-12
•
Granted: 1956-11-20
•
Expires: 1973-03-12
Abstract
No abstract record available.
Inventors
- 👤 John A Weedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:31
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/20; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08; C07C7/10; C07C2601/00; C07C2601/06; C07C2601/08; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A PROCESS FOR THE SEPARATION AND RECOVERY OF A NAPHTHENE HYDROCARBON FROM AN AROMATIC-FREE MIXTURE OF NAPHTHENE HYDROCARBONS AND PARAFFIN HYDROCARBONS HAVING SIMILAR BOILIN POINTS, WHICH COMPRISES CONTACTING SAID MIXTURE WITH LIQUID 2-PYRROLIDONE AT A TEMPERATURE IN THE RANGE 100 TO 350* F. RECOVERING A SOLVENT PHASE; AND RECOVERING A NAPHTHENE HYDROCARBON FROM SAID SOLVENT PHASE.
Claim 2
Dependent Claim
56 words
A PROCESS FOR THE SEPARATION AND RECOVERY OF A NAPHTHENE HYDROCARBON FROM AN AROMATIC-FREE MIXTURE OF NAPHTHENE HYDROCARBONS AND PARAFFIN HYDROCARBONS HAVING SIMILAR BOILIN POINTS, WHICH COMPRISES CONTACTING SAID MIXTURE WITH LIQUID 2-PYRROLIDONE AT A TEMPERATURE IN THE RANGE 100 TO 350* F. RECOVERING A SOLVENT PHASE; AND RECOVERING A NAPHTHENE HYDROCARBON FROM SAID SOLVENT PHASE.
References Cited (Backward Citations)
US2396299A
Cited
US2396302A
Cited
US2433751A
Cited
US2508723A
Cited
US2552198A
Cited
US2599649A
Cited
US2667446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |