US3214385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactivation of spent palladium-oncarbon hydrogenation catalyst
Assignee: FMC Corp
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Filing: 1961-12-20
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Granted: 1965-10-26
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Expires: 1981-12-20
Abstract
No abstract record available.
Inventors
- 👤 John M Kolyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:10
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
THE METHOD OF REACTIVATING A SPENT PALLADIUM-ONCARBON CATALYST FOR REUSE IN THE PREPARATION OF BUTYROLACTONE BY THE HYDROGENATION OF SUCCINIC ANHYDRIDE WHICH COMPRISES CONTACTING THE CATALYST WITH A 1-50% ALKALI METAL HYDROXIDE SOLUTION, WASHING SAID CATALYST WITH WATER UNTIL THE WASH WATER HAS A PH IN THE RANGE OF 7.5-10, DRYING SAID CATALYST, AND EXPOSING SAID CATALYST TO A GAS CONTAINING FREE OXYGEN.
Claim 2
Independent Claim
63 words
THE METHOD OF REACTIVATING A SPENT PALLADIUM-ONCARBON CATALYST FOR REUSE IN THE PREPARATION OF BUTYROLACTONE BY THE HYDROGENATION OF SUCCINIC ANHYDRIDE WHICH COMPRISES CONTACTING THE CATALYST WITH A 1-50% ALKALI METAL HYDROXIDE SOLUTION, WASHING SAID CATALYST WITH WATER UNTIL THE WASH WATER HAS A PH IN THE RANGE OF 7.5-10, DRYING SAID CATALYST, AND EXPOSING SAID CATALYST TO A GAS CONTAINING FREE OXYGEN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |