Patent US5839077A successfully refreshed from Google Patents.
US2786752A
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Recovery of platinum from alumina base platinum catalyst
Assignee: Universal Oil Products Co
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Filing: 1954-01-13
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Granted: 1957-03-26
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Expires: 1974-01-13
Abstract
No abstract record available.
Inventors
- 👤 Herbert R Appell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:17
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A METHOD OF RECOVERING A NOBLE METAL FORM A COMPOSITE THEREOF WITH A REFRACTORY INORGANIC OXIDE AND A METAL SULFIDE NON-REACTIVE WITH MINERAL ACID, WHICH COMPRISES DIGESTING SAID COMPOSITE WITH A STRONG MINERAL ACID OF LESSER OXIDIZING ACTIVITY THAN NITRIC ACID AND, IN ADDITON TO SAID ACID, AN OXIDIZING AGENT WHICH IS SUBSTANTIALLY FREE OF COMBINED NITROGEN, WHEREBY TO CONVERT SADI SULFIED TO SULFATE AND TO DISSOLVE THE LATER AND THE INORGANIC OXIDE, AND SEPARATING THE RESULTANT SOLUTON FROM THE UNDISSOLVED NOBLE METAL.
Claim 2
Independent Claim
83 words
A METHOD OF RECOVERING A NOBLE METAL FORM A COMPOSITE THEREOF WITH A REFRACTORY INORGANIC OXIDE AND A METAL SULFIDE NON-REACTIVE WITH MINERAL ACID, WHICH COMPRISES DIGESTING SAID COMPOSITE WITH A STRONG MINERAL ACID OF LESSER OXIDIZING ACTIVITY THAN NITRIC ACID AND, IN ADDITON TO SAID ACID, AN OXIDIZING AGENT WHICH IS SUBSTANTIALLY FREE OF COMBINED NITROGEN, WHEREBY TO CONVERT SADI SULFIED TO SULFATE AND TO DISSOLVE THE LATER AND THE INORGANIC OXIDE, AND SEPARATING THE RESULTANT SOLUTON FROM THE UNDISSOLVED NOBLE METAL.
References Cited (Backward Citations)
GB289220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |