US2787540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of platinum
Assignee: Universal Oil Products Co
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Filing: 1949-12-22
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Granted: 1957-04-02
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Expires: 1969-12-22
Abstract
No abstract record available.
Inventors
- 👤 Herbert R Appell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:25
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/04; C22B11/042; C22B11/048; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/24; C01; C01G; C01G55/00; C01G55/001; C22B3/00; C22B3/20; C22B3/26; C22B3/32; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
IN THE RECOVERY OF PLATINUM FROM A CATALYST CONTAINING THE SAME, WHEREIN THE PLATINUM IS DISSOLVED IN AQUA REGIA AND SUBSEQUENTLY PRECIPITATED FROM THE SOLUTION BY THE ADDITION OF A PRECIPITATING AGENT FOR PLATINUM, THE IMPROVEMENT WHICH COMPRISES ALSO ADDING AN AMIDE TO PREVENT REDISSOLVING OF THE PRECIPITATED PLATINUM.
Claim 2
Dependent Claim
49 words
IN THE RECOVERY OF PLATINUM FROM A CATALYST CONTAINING THE SAME, WHEREIN THE PLATINUM IS DISSOLVED IN AQUA REGIA AND SUBSEQUENTLY PRECIPITATED FROM THE SOLUTION BY THE ADDITION OF A PRECIPITATING AGENT FOR PLATINUM, THE IMPROVEMENT WHICH COMPRISES ALSO ADDING AN AMIDE TO PREVENT REDISSOLVING OF THE PRECIPITATED PLATINUM.
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) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |