US3645913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of copper oxide and copper chromite catalysts
Assignee: Dow Chemical Co
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Filing: 1969-12-05
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Granted: 1972-02-29
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Expires: 1989-12-05
Abstract
Abstract THE ACTIVITY OF A COPPER OXIDE OR COPPER CHROMITE CATALYST DEACTIVATED WHILE BEING USED TO CONVERT A NITRILE TO THE CORRESPONDING AMIDE MAY BE REGENERATED BY OXIDIZING THE USED CATALYST IN AN OXYGEN-CONTAINING GAS AT AN ELEVATED TEMPERATURE AND THEN CONTACTING THE OXIDIZED COPPER OXIDE OR COPPER CHROMITE WITH A REDUCING AGENT SUCH AS HYDROGEN AT AN ELVATED TEMPERATURE.
Inventors
- 👤 Clarence E Habermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:57
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/72; 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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |