US3579566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of anhydrides
Assignee: Union Oil Company of California
•
Filing: 1967-12-13
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Granted: 1971-05-18
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Expires: 1987-12-13
Abstract
Abstract A PROCESS FOR REDUCTIN OF ORGANIC ACID ANHYDRIDES COMPRISING REACTING THE ANHYDRIDE WITH HYDROGEN IN THE PRESENCE OF A CATALYST COMPRISING A COMPLEX OF A GROUP VIII NOBLE METAL WITH A BIPHYLLIC LIGAND FROM THE GROUP CONSISTING OF ORGANIC PHOSPHINES, ORGANIC ARSINES AND ORGANIC STIBINES.
Inventors
- 👤 Donald M Fenton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:53
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/41; C07C67/00; C07C67/36
Claims Analysis
Total Claims: 0
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |