US2961473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous lactones as selective solvents for diolefins
Assignee: Phillips Petroleum Co
•
Filing: 1958-05-12
•
Granted: 1960-11-22
•
Expires: 1978-05-12
Abstract
No abstract record available.
Inventors
- 👤 Gardner C Ray
- 👤 Forrest N Ruehlen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:00
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
IN THE SEPARATION OF DIOLEFINS FROM A MIXTURE CONTAINING DIOLEFINS AND OLEFINS THE STEP OF SOLVENT EXTRACTING SAID MIXTURE WITH AN AQUEOUS SOLUTION OF A LACTONE OF AN ALIPHATIC ACID HAVING FROM 4 TO 12 CARBON ATOMS PER MOLECULE, SAID SOLUTION CONTAINING FROM 5% TO 40% BY VOLUME OF WATER.
Claim 2
Dependent Claim
50 words
IN THE SEPARATION OF DIOLEFINS FROM A MIXTURE CONTAINING DIOLEFINS AND OLEFINS THE STEP OF SOLVENT EXTRACTING SAID MIXTURE WITH AN AQUEOUS SOLUTION OF A LACTONE OF AN ALIPHATIC ACID HAVING FROM 4 TO 12 CARBON ATOMS PER MOLECULE, SAID SOLUTION CONTAINING FROM 5% TO 40% BY VOLUME OF WATER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |