US3796670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of regenerating an aged raney nickel catalyst with carboxylic acid and base treatment
Assignee: WR Grace and Co Conn
•
Filing: 1970-10-21
•
Granted: 1974-03-12
•
Expires: 1990-10-21
Abstract
Abstract RANEY NICKEL CATALYSTS WHICH HAVE AGED FROM STORAGE ARE REGENERATED BY SUCCESSIVE TREATMENT IN AN AQUEOUS ORGANIC ACID SOLUTION AND IN AN AQUEOUS BASE SOLUTION. THEN THE CATALYST IS SEPARATED AND WASHED. THE REGENERATED CATALYST HAS A HIGHER ACTIVITY THAN THE FRESHLY PREPARED CATALYST.
Inventors
- 👤 R Anderson
- 👤 W Pieters
- 👤 J Freel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:26
CPC Classifications
B; B01; B01J; B01J25/00; B01J25/04
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |