Patent US2726141A successfully refreshed from Google Patents.
US2726141A
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US
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Process for removing impurities from precious metal compounds in solution by means of cation exchange materials
Assignee: Universal Oil Products Co
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Filing: 1952-07-31
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Granted: 1955-12-06
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Expires: 1972-07-31
Abstract
No abstract record available.
Inventors
- 👤 Herbert R Appell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:36
CPC Classifications
C; C01; C01G; C01G5/00; B; B01; B01J; B01J39/00; C01G55/00; C01G55/001; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A PROCESS FOR REMOVING A CATION IMPURITY CONTAINED IN AN AQUEOUS SOLUTION OF AN ACID HAVING AS AN ANION A CHLORINE COMPLEX OF A PRECIOUS METAL, WHICH COMPRISES CONTACTING SAID SOLUTION AT A PH VALUE ABOVE ABOUT 1 WITH A SOLID CATION EXCHANGE MATERIAL FOR A SUFFICIENT TIME TO ABSORB SUBSTANTIALLY ALL OF SAID CATION IMPURITY IN THE SOLID MATERIAL, AND WITHDRAWING THE THUS PURIFIED ACID SOLUTION FROM SAID SOLID MATERIAL.
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) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |