US3082079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver recovery from photographic fixing solutions
Assignee: Eastman Kodak Co
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Filing: 1960-06-15
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Granted: 1963-03-19
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Expires: 1980-06-15
Abstract
No abstract record available.
Inventors
- 👤 David K Bulloch
- 👤 Deane S Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:26
CPC Classifications
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
83 words
A METHOD OF RECOVERING METALLIC SILVER FROM A THIOSULFATE PHOTOGRAPHIC FIXING BATH CONTAINING COMPLES SILVER THIOSULFATE COMPOUNDS AND HAVING A PH WITHIN THE RANGE OF APPROXIMATELY 6 TO 8 WHICH COMPRISES ADDING AN ALKALI METAL BOROHYDRIDE AND POTASSIUM BOROHYDRIDE TO SAID SODIUM BOROHYDRIDE AND POTASSIUM BOROHYDRIDE TO SAID BATH IN AMOUNT APPROXIMATELY STOICHIOMETRICALLY EQUAL TO THE AMOUNT OF SILVER COMPOUND IN THE BATH AND SEPARATING THE METALLIC SILVER FROM THE BATH, SAID BATH, AFTER SILVER SEPARATION, BEING REFUSABLE AS A PHOTOGRAPHIC FIXING BATH.
Claim 2
Independent Claim
83 words
A METHOD OF RECOVERING METALLIC SILVER FROM A THIOSULFATE PHOTOGRAPHIC FIXING BATH CONTAINING COMPLES SILVER THIOSULFATE COMPOUNDS AND HAVING A PH WITHIN THE RANGE OF APPROXIMATELY 6 TO 8 WHICH COMPRISES ADDING AN ALKALI METAL BOROHYDRIDE AND POTASSIUM BOROHYDRIDE TO SAID SODIUM BOROHYDRIDE AND POTASSIUM BOROHYDRIDE TO SAID BATH IN AMOUNT APPROXIMATELY STOICHIOMETRICALLY EQUAL TO THE AMOUNT OF SILVER COMPOUND IN THE BATH AND SEPARATING THE METALLIC SILVER FROM THE BATH, SAID BATH, AFTER SILVER SEPARATION, BEING REFUSABLE AS A PHOTOGRAPHIC FIXING BATH.
References Cited (Backward Citations)
US2194056A
Cited
US2461661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-18 | 1966-09-17 | 1967-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-18 | 1970-09-17 | 1971-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-18 | 1974-09-17 | 1975-03-19 | $7700.00 | Window Closed / Lapsed |