US2720531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrite treatment of nickel catalyst to prevent nuclear hydrogenation in reduction of anthraquinones
Assignee: FMC Corp
•
Filing: 1952-08-21
•
Granted: 1955-10-11
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Expires: 1972-08-21
Abstract
No abstract record available.
Inventors
- 👤 Robert R Umhoefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:43
CPC Classifications
B; B01; B01J; B01J25/00; B01J25/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
IN THE PROCESS OF HYDROGENATING ANTHRAQUINONES DISSOLVED IN LIQUID PHASE IN THE PRESENCE OF A NICKEL CATALYST, THE METHOD OF PREVENTING NUCLEAR HYDROGENATION WHICH COMPRISES CARRYING OUT THE REACTION IN THE PRESENCE OF AN ORGANIC NITRITE.
Claim 2
Dependent Claim
36 words
IN THE PROCESS OF HYDROGENATING ANTHRAQUINONES DISSOLVED IN LIQUID PHASE IN THE PRESENCE OF A NICKEL CATALYST, THE METHOD OF PREVENTING NUCLEAR HYDROGENATION WHICH COMPRISES CARRYING OUT THE REACTION IN THE PRESENCE OF AN ORGANIC NITRITE.
References Cited (Backward Citations)
US2495521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |