US3699054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper chromite hydrogenation catalyst regeneration process
Assignee: Celanese Corp
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Filing: 1971-04-29
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Granted: 1972-10-17
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Expires: 1991-04-29
Abstract
Abstract A SPENT COPPER CHROMITE HYDROGENATION CATALYST IS RESTORED TO A CATALYTICALLY ACTIVE CONDITION BY A PROCESS WHICH COMPRISES (A) WASHING ORGANIC MATERIALS THEREFROM WITH A VOLATILE SOLVENT, (B) DRYING THE WASHED CATALYST TO REMOVE THE VOLATILE SOLVENT THEREFROM, AND (C) HEATING THE WASHED, DRIED CATALYST IN AN ATMOSPHERE COMPRISING MOLECULAR OXYGEN AT A CONTROLLED TEMPERATURE.
Inventors
- 👤 Glenn E Organ
- 👤 Ronald H Wile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:12
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/94; C; C07; C07C; C07C29/00; C07C29/132; C07C29/136; C07C29/147; C07C29/149; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |