US3733256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for extracting silver from silver bearing materials
Assignee: Future Systems Inc
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Filing: 1970-10-12
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Granted: 1973-05-15
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Expires: 1990-10-12
Abstract
Abstract A PROCESS FOR EXTRACTING AND RECOVERING SILVER FROM THE GELATIN LAYER OF PHOTOGRAPHIC OR OTHER SOLID BASE MATERIALS INCLUDING THE STEPS OF TREATING THE MATERIAL WITH AN AQUEOUS SOLUTION OF OXIDIZING SALT TO OXIDIZE THE METALLIC SILVER IN THE GELATIN LAYER OF THE MATERIAL, WASHING THE MATERIAL WITH A COMPLEXING AGENT, SOLUTION TO FORM SILVER THIOSULFATE IONS AND RECOVERING THE SILVER FROM THE COMPLEXING AGENT SOLUTION.
Inventors
- 👤 R Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:04
CPC Classifications
G; G03; G03C; G03C11/00; G03C11/24; C; C22; C22B; C22B11/00; C22B11/04; C22B11/042; C22B11/046; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |