US3640897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylamide polymers as flocculants in recovery of nickel catalysts
Assignee: Zeneca Inc
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Filing: 1969-08-12
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Granted: 1972-02-08
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Expires: 1989-08-12
Abstract
Abstract AN IMPROVED PROCESS FOR THE RECOVERY AND PRODUCTION OF SUPPORTED NICKEL HYDROGENATION CATALYST IS DISCLOSED. THE IMPROVEMENT BEING IN THE WASHING AND FILTRATION STEP OF THE RECOVERY OF THE NICKEL AND PRECIPITATION OF SAME ON THE SUPPORT; NAMELY SILICA OR CARBON, TO FORM THE UNACTIVATED "GREEN CATALYST" OF THE PROCESS.
Inventors
- 👤 Alfred J Restaino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:09
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/94
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) | 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 |