US2635080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactivating a supported platinum catalyst
Assignee: Universal Oil Products Co
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Filing: 1950-03-17
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Granted: 1953-04-14
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Expires: 1970-03-17
Abstract
No abstract record available.
Inventors
- 👤 Herbert R Appell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:27
CPC Classifications
C; C01; C01G; C01G55/00; B; B01; B01J; B01J23/00; B01J23/90; B01J23/96; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584; Y10; Y10S; Y10S252/00; Y10S252/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
A METHOD OF REACTIVATING A SPENT CATALYST CONTAINING PLATINUM SUPPORTED ON ALUMINA WHICH COMPRISES TREATING SAID CATALYST WITH AN AQUEOUS SOLUTION OF ALUMINUM NITRATE WITH AN AQUEOUS CHLORIDE AND DISSOLVING A SUBSTANTIAL PORTION, AT LEAST, OF THE PLATINUM IN SAID SOLUTION WITHOUT DISSOLVING SAID ALUMINA TO A SUBSTANTIAL EXTENT, AND SUBSEQUENTLY REIMPREGNATING THE ALUMINA WITH PLATINUM.
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) | 1956-04-13 | 1956-10-13 | 1957-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-13 | 1960-10-13 | 1961-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-13 | 1964-10-13 | 1965-04-14 | $7700.00 | Window Closed / Lapsed |