US2507175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver recovery
Assignee: Eastman Kodak Co
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Filing: 1947-07-11
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Granted: 1950-05-09
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Expires: 1967-07-11
Abstract
No abstract record available.
Inventors
- 👤 Stephen C Pool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:48
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/395; G03C5/3952; C; C22; C22B; C22B11/00; C22B11/04; C22B11/042; C22B11/046; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR RECOVERING SILVER FROM WASTE PHOTOGRAPHIC SOLUTIONS CONTAINING RECOVERABLE SILVER AND SUBSTANTIAL AMOUNTS OF HYDROXY ORGANIC ACIDS INCLUDING TARTARIC, CITRIC, SALICYLIC, AND MALIC, WHICH COMPRISES ADDING MAGNESIUM SULFATE TO THE SOLUTION ADDING SLAKED LIME TO ADJUST THE PH OF THE SOLUTION TO AT LEAST 10, WHEREBY A MAGNESIUM HYDROXIDE FLOC IS FORMED, PERMITTING THE FLOC TO COAGULATE THE SOLIDS PRESENT IN THE SOLUTION AND TO PRECIPITATE IN THE FORM OF A SLUDGE FROM WHICH SILVER MAY BE OBTAINED BY A SEPARATION PROCESS.
Claim 2
Dependent Claim
84 words
A PROCESS FOR RECOVERING SILVER FROM WASTE PHOTOGRAPHIC SOLUTIONS CONTAINING RECOVERABLE SILVER AND SUBSTANTIAL AMOUNTS OF HYDROXY ORGANIC ACIDS INCLUDING TARTARIC, CITRIC, SALICYLIC, AND MALIC, WHICH COMPRISES ADDING MAGNESIUM SULFATE TO THE SOLUTION ADDING SLAKED LIME TO ADJUST THE PH OF THE SOLUTION TO AT LEAST 10, WHEREBY A MAGNESIUM HYDROXIDE FLOC IS FORMED, PERMITTING THE FLOC TO COAGULATE THE SOLIDS PRESENT IN THE SOLUTION AND TO PRECIPITATE IN THE FORM OF A SLUDGE FROM WHICH SILVER MAY BE OBTAINED BY A SEPARATION PROCESS.
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) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |