US2612470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective electrodeposition of silver
Assignee: Individual
•
Filing: 1949-10-26
•
Granted: 1952-09-30
•
Expires: 1969-10-26
Abstract
No abstract record available.
Inventors
- 👤 Jr John C Griess
- 👤 Lockhart B Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:31
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A METHOD FOR THE SEPARATION AND SELECTIVE RECOVERY OF DISSOLVED SILVER PRESENT IN TRACE CONCENTRATIONS AT LEAST AS GREAT AS 10-8 MOLAR FROM AN AQUEOUS PALLADIUM SOLUTION CONTAINING THE SAME AND HAVING A MACROSCOPIC PALLADIUM CONCENTRATION WITHIN THE APPROXIMATE RANGE OF 10-3 TO 1 MOLAR, WHICH COMPRISES INCORPORATING INTO SAID SOLUTION, AN AGENT WHICH FORMS WATER-SOLUBLE COMPLEXES WITH BOTH SILVER AND PALLADIUM CHOSEN FROM THE GROUP OF SUCH AGENTS CONSISTING OF AMMONIUM HYDROXIDE, AND THE CYANIDES, THIOCYANATES, AND THIOSULFATES OF SODIUM AND OF POTASSIUM, IN AN AMOUNT IN EXCESS OVER THE STOICHIOMETRIC AMOUNT REQUIRED FOR SOLUBLE COMPLEX FORMATION WITH ALL OF THE SILVER AND PALLADIUM PRESENT, TO THEREBY SOLUBLY COMPLEX THE SILVER AND PALLADIUM CONTENT OF THE SOLUTION, AND THEREUPON, WHILE MAINTAINING THE PH ALKALINE, ELECTROLYZING THE RESULTING SOLUTION TO EFFECT METAL ELECTRODEPOSITION UPON A PLATINUM CATHODE WHILE RESTRICTING THE CATHODE POTENTIALS IMPRESSED THEREFOR TO THOSE AT LEAST AS POSITIVE AS THAT, DEMARCATING THE CATHODIC PALLADIUM DEPOSITION POTENTIAL OF THE RESULTING SYSTEM, THEREBY EFFECTING SELECTIVE ELECTRODEPOSITION OF SILVER FROM THE SOLUTION.
Claim 2
Independent Claim
171 words
A METHOD FOR THE SEPARATION AND SELECTIVE RECOVERY OF DISSOLVED SILVER PRESENT IN TRACE CONCENTRATIONS AT LEAST AS GREAT AS 10-8 MOLAR FROM AN AQUEOUS PALLADIUM SOLUTION CONTAINING THE SAME AND HAVING A MACROSCOPIC PALLADIUM CONCENTRATION WITHIN THE APPROXIMATE RANGE OF 10-3 TO 1 MOLAR, WHICH COMPRISES INCORPORATING INTO SAID SOLUTION, AN AGENT WHICH FORMS WATER-SOLUBLE COMPLEXES WITH BOTH SILVER AND PALLADIUM CHOSEN FROM THE GROUP OF SUCH AGENTS CONSISTING OF AMMONIUM HYDROXIDE, AND THE CYANIDES, THIOCYANATES, AND THIOSULFATES OF SODIUM AND OF POTASSIUM, IN AN AMOUNT IN EXCESS OVER THE STOICHIOMETRIC AMOUNT REQUIRED FOR SOLUBLE COMPLEX FORMATION WITH ALL OF THE SILVER AND PALLADIUM PRESENT, TO THEREBY SOLUBLY COMPLEX THE SILVER AND PALLADIUM CONTENT OF THE SOLUTION, AND THEREUPON, WHILE MAINTAINING THE PH ALKALINE, ELECTROLYZING THE RESULTING SOLUTION TO EFFECT METAL ELECTRODEPOSITION UPON A PLATINUM CATHODE WHILE RESTRICTING THE CATHODE POTENTIALS IMPRESSED THEREFOR TO THOSE AT LEAST AS POSITIVE AS THAT, DEMARCATING THE CATHODIC PALLADIUM DEPOSITION POTENTIAL OF THE RESULTING SYSTEM, THEREBY EFFECTING SELECTIVE ELECTRODEPOSITION OF SILVER FROM THE SOLUTION.
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) | 1955-09-30 | 1956-03-31 | 1956-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-30 | 1960-03-31 | 1960-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-30 | 1964-03-31 | 1964-09-30 | $7700.00 | Window Closed / Lapsed |