Silver recovery system
Abstract
Abstract A non-agitated electrolytic cell for the recovery of silver from photographic chemical solutions which comprises a vertical tubular cathode enclosing an anode. The cell is operated at a low current density of between 50 and 100 milliamps per square foot of effective cathode area and the solution rich in silver is supplied continuously or in batches to the lower end of the cell, while the solution depleted of its silver content flows simultaneously from the top of the cell. For processing larger volumes of solution a cellular cathode assembly is used defining a bank of such cathode cells, there being a corresponding anode assembly with an anode disposed in each cell. The anodes are connected in isolated groups, each group being placed in circuit with an overload protection device, so that occurrence of a short-circuit in one group of anodes does not affect the operation of the remaining groups.
Inventors
- 👤 M Rowe
Bibliographic Details
Claims Analysis
Total Claims: 1References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |