US3641071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarboxylation reaction to form straight-chain anhydrides
Assignee: Union Oil Company of California
•
Filing: 1969-06-11
•
Granted: 1972-02-08
•
Expires: 1989-06-11
Abstract
Abstract A PROCESS FOR THE FORMATION OF STRAIGHT-CHAIN CARBOXYLIC ACID ANHYDRIDES COMPRISING CONTACTING AN ETHYLENICALLY UNSATURATED HYDROCARBON, CARBON MONOXIDE AND A CARBOXYLIC ACID WITH A GROUP VIII NOBLE METAL IN COMPLEX ASSOCIATION WITH A BIPHYLLIC LIGAND WHEREIN THE REACTION IS PERFORMED IN A REACTION MEDIUM CONTAINING 10 VOLUME PERCENT OF A CARBOXYLIC ACID ANHYDRIDE FOR THE ENTIRE OR, AT LEAST, A SUBSTANTIAL PORTION OF THE REACTION PERIOD AND AT A TEMPERATURE BETWEEN 100* AND 300*C. THE PRESENCE OF THE ANHYDRIDE HAS BEEN FOUND TO INCREASE THE YIELD OF STRAIGHT-CHAIN ANHYDRIDES.
Inventors
- 👤 Donald M Fenton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:01
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/56; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |