US3311468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver recovery process
Assignee: Individual
•
Filing: 1963-12-26
•
Granted: 1967-03-28
•
Expires: 1983-12-26
Abstract
No abstract record available.
Inventors
- 👤 Davidoff Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:14
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A METHOD OF RECOVERING SILVER FROM AN AQUEOUS SOLUTION OF ALKALI METAL SILVER CYANIDE COMPRISING ADDING TO THE SOLUTION ABOUT 0.5 TO 1 MOLE OF A WATER SOLUBLE ADDITION PRODUCT OF AN ALIPHATIC ALDEHYDE WITH AN ALKALI METAL HYDROSULFITE FOR EACH MOLE OF SILVER IN THE SOLUTION, MAINTAINING THE RESULTING AT AN ELEVATED TEMPERATURE ABOVE ABOUT 150*F. UNTIL CESSATION OF PRECIPITATION OF THE SILVER, AND REMOVING THE PRECIPITATED SILVER FROM THE SOLUTION.
Claim 2
Independent Claim
72 words
A METHOD OF RECOVERING SILVER FROM AN AQUEOUS SOLUTION OF ALKALI METAL SILVER CYANIDE COMPRISING ADDING TO THE SOLUTION ABOUT 0.5 TO 1 MOLE OF A WATER SOLUBLE ADDITION PRODUCT OF AN ALIPHATIC ALDEHYDE WITH AN ALKALI METAL HYDROSULFITE FOR EACH MOLE OF SILVER IN THE SOLUTION, MAINTAINING THE RESULTING AT AN ELEVATED TEMPERATURE ABOVE ABOUT 150*F. UNTIL CESSATION OF PRECIPITATION OF THE SILVER, AND REMOVING THE PRECIPITATED SILVER FROM THE SOLUTION.
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) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |