US2863760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of platinum from platinum-aluminum catalyst
Assignee: Wyeth Holdings LLC
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Filing: 1953-09-24
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Granted: 1958-12-09
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Expires: 1973-09-24
Abstract
No abstract record available.
Inventors
- 👤 Kenneth D Ashley
- 👤 Malden W Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:14
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/04; C22B11/042; C22B11/048; B; B01; B01J; B01J23/00; B01J23/90; B01J23/96; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A METHOD OF RECOVERING PLATINUM FROM ALUMINAPLATINUM-CONTAINING CATALYTIC MATERIAL WHICH COMPRISES DIGESTING SAID CATALYTIC MATERIAL WITH A STOICHIOMETRIC EXCESS OF SULFURIC ACID WHEREBY THE ALUMINA GOES INTO SOLUTION AND PLATINUM REMAINS IN SUSPENSION, PASSING HYDROGEN SULFIDE THROUGH SAID SOLUTION TO PRECIPITATE ANY SOLUBLE PLATINUM THEREIN, FLOCCULATING THE PLATINUM IN SUSPENSION AND THE PRECIPITATED PLATINUM SULFIDE, AND SEPARATING THE FLOCCULATED PLATINUM-CONTAINING MATERIALS FROM THE SOLUTION.
Claim 2
Independent Claim
64 words
A METHOD OF RECOVERING PLATINUM FROM ALUMINAPLATINUM-CONTAINING CATALYTIC MATERIAL WHICH COMPRISES DIGESTING SAID CATALYTIC MATERIAL WITH A STOICHIOMETRIC EXCESS OF SULFURIC ACID WHEREBY THE ALUMINA GOES INTO SOLUTION AND PLATINUM REMAINS IN SUSPENSION, PASSING HYDROGEN SULFIDE THROUGH SAID SOLUTION TO PRECIPITATE ANY SOLUBLE PLATINUM THEREIN, FLOCCULATING THE PLATINUM IN SUSPENSION AND THE PRECIPITATED PLATINUM SULFIDE, AND SEPARATING THE FLOCCULATED PLATINUM-CONTAINING MATERIALS FROM THE SOLUTION.
References Cited (Backward Citations)
US191160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |