US2908731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin purieication by solvent extraction
Assignee: Phillips Petroleum Co
•
Filing: 1957-06-19
•
Granted: 1959-10-13
•
Expires: 1977-06-19
Abstract
No abstract record available.
Inventors
- 👤 Robert A Koble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:40
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/10; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A METHOD FOR RECOVERING AN OLEFIN HYDROCARBON FROM A HYDROCARBON MIXTURE COMPRISING AN OLEFIN, A PARAFFIN AND AN ALKYNE HAVING SIMILAR BOILING POINTS WHICH COMPRISES CONTACTING SAID MIXTURE WITH DIMETHYLFORMAMIDE, RECOVERING AN EXTRACT RICH IN OLEFIN AND ALKYNE, SUBJECTING SAID EXTRACT TO CONTACT WITH ADDITIONAL SOLVENT AND EXTRACTIVE DISTILLATION, AND RECOVERING A SUBSTANTIALLY PURE OLEFIN PRODUCT.
Claim 2
Independent Claim
56 words
A METHOD FOR RECOVERING AN OLEFIN HYDROCARBON FROM A HYDROCARBON MIXTURE COMPRISING AN OLEFIN, A PARAFFIN AND AN ALKYNE HAVING SIMILAR BOILING POINTS WHICH COMPRISES CONTACTING SAID MIXTURE WITH DIMETHYLFORMAMIDE, RECOVERING AN EXTRACT RICH IN OLEFIN AND ALKYNE, SUBJECTING SAID EXTRACT TO CONTACT WITH ADDITIONAL SOLVENT AND EXTRACTIVE DISTILLATION, AND RECOVERING A SUBSTANTIALLY PURE OLEFIN PRODUCT.
References Cited (Backward Citations)
US2159434A
Cited
US2391102A
Cited
US2405905A
Cited
US2408010A
Cited
US2484305A
Cited
US2508723A
Cited
US2515217A
Cited
US2652439A
Cited
US2690417A
Cited
US2736756A
Cited
US2779458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |