US2648601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of precious metal values
Assignee: Merrill Co
•
Filing: 1948-07-16
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Granted: 1953-08-11
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Expires: 1968-07-16
Abstract
No abstract record available.
Inventors
- 👤 Raymond E Byler
- 👤 Robert C Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:31
CPC Classifications
C; C01; C01G; C01G7/00; C01G7/003; C01G5/00; C01G5/003; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS OF RECOVERING PRECIOUS METAL VALUES FROM ORE, THE STEPS OF DISSOLVING SAID VALUES BY CYANIDATION; ADJUSTING AND MAINTAINING THE FREE HYDROXYL ION CONCENTRATION OF THE CYANIDE SOLUTION IN A PH RANGE BETWEEN 8 TO 11 AFTER ECONOMIC COMPLETION OF THE DISSOLUTION OF SAID VALUES WHILE SORBING SAID DISSOLVED VALUES ON A RESINOUS POLYAMINE ANION EXCHANGER IN FREE BASE CONDITION; SEPARATING SAID EXCHANGER WITH THE SORBED VALUES FROM SAID SOLUTION; AND DESORBING SAID VALUES FROM SAID SEPARATED EXCHANGER IN AN ALKALINE SOLUTION DIFFERENT FROM SAID CYANIDE SOLU-
Claim 2
Dependent Claim
89 words
IN A PROCESS OF RECOVERING PRECIOUS METAL VALUES FROM ORE, THE STEPS OF DISSOLVING SAID VALUES BY CYANIDATION; ADJUSTING AND MAINTAINING THE FREE HYDROXYL ION CONCENTRATION OF THE CYANIDE SOLUTION IN A PH RANGE BETWEEN 8 TO 11 AFTER ECONOMIC COMPLETION OF THE DISSOLUTION OF SAID VALUES WHILE SORBING SAID DISSOLVED VALUES ON A RESINOUS POLYAMINE ANION EXCHANGER IN FREE BASE CONDITION; SEPARATING SAID EXCHANGER WITH THE SORBED VALUES FROM SAID SOLUTION; AND DESORBING SAID VALUES FROM SAID SEPARATED EXCHANGER IN AN ALKALINE SOLUTION DIFFERENT FROM SAID CYANIDE SOLU-
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) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |