Patent US2756243A successfully refreshed from Google Patents.
US2756243A
Expired / Lapsed
US
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Treatment of nickel catalyst to prevent nuclear hydrogenation of anthraquinones
Assignee: FMC Corp
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Filing: 1954-07-12
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Granted: 1956-07-24
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Expires: 1974-07-12
Abstract
No abstract record available.
Inventors
- 👤 Robert R Umhoefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:58
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN THE PROCESS OF HYDROGENATING AN ANTHRAQUINONE TO ANTHRAHYDROQUINONE IN A SOLVENT MEDIUM CONTAINING A RANEY NICKEL HYDROGENATION CATALYST, THE IMPROVEMENT WHICH COMPRISES PREVENTING HYDROGENATION OF THE QUINONE NUCLEUS BY PERFORMING THE HYDROGENATION WITH NICKEL CATALYST IN CONTACT WITH A MIXTURE OF PYRIDINE AND PYRIDINE CARBOXYLIC ACID, SAID MIXTURE CONTAINING A QUANTITY OF AN ORGANIC BASE SUFFICIENT TO SUBSTANTIALLY NEUTRALIZE THE ACIDIC COMPONENTS OF THE MIXTURE.
Claim 2
Dependent Claim
66 words
IN THE PROCESS OF HYDROGENATING AN ANTHRAQUINONE TO ANTHRAHYDROQUINONE IN A SOLVENT MEDIUM CONTAINING A RANEY NICKEL HYDROGENATION CATALYST, THE IMPROVEMENT WHICH COMPRISES PREVENTING HYDROGENATION OF THE QUINONE NUCLEUS BY PERFORMING THE HYDROGENATION WITH NICKEL CATALYST IN CONTACT WITH A MIXTURE OF PYRIDINE AND PYRIDINE CARBOXYLIC ACID, SAID MIXTURE CONTAINING A QUANTITY OF AN ORGANIC BASE SUFFICIENT TO SUBSTANTIALLY NEUTRALIZE THE ACIDIC COMPONENTS OF THE MIXTURE.
References Cited (Backward Citations)
US2495521A
Cited
US2602092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |