US3728244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High current density electrolytic cell
Assignee: Individual
•
Filing: 1971-06-21
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Granted: 1973-04-17
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Expires: 1991-06-21
Abstract
Abstract APPARATUS FOR RECOVERING A METAL FROM A SOLUTION IN WHICH THE METAL IS PRESENT IN IONIC FORM, INCLUDING A PAIR OF OPPOSITELY DISPOSED ELECTRODES SEALED TO AND SEPARATED BY AN ELECTRICALLY NON-CONDUCTIVE SPACING ELEMENT WHICH FORMS A DISK-SHAPED CHAMBER THROUGH WHICH THE SOLUTION IS CIRCULATED AND MEANS FOR IMPRESSING AN ELECTRIC POTENTIAL ACROSS THE ELECTRODES TO CAUSE THEMETAL IONS IN THE SOLUTION TO PLATE OUT ON THE ELECTRODE SURFACE OF LOWER POTENTIAL. THE APPARATUS IS PARTICULARLY WELL ADAPTED TO RECOVERING SILVER FROM FIXING SOLUTIONS EMPLOYED IN PHOTOGRAPHIC PROCESSING AND PERMITS SUCH RECOVERY TO BE EFFECTED AT EXCEPTIONALLY HIGH CURRENT DENSITIES.
Inventors
- 👤 A Cooley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:07
CPC Classifications
C; C25; C25C; C25C7/00
Claims Analysis
Total Claims: 0
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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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |