Patent US1989969A successfully refreshed from Google Patents.
Patent US3647422A successfully refreshed from Google Patents.
US3647422A
Expired / Lapsed
US
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Recovery of silver, polyester and amino acids from processed film
Assignee: Horizons Research Inc
•
Filing: 1970-07-13
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Granted: 1972-03-07
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Expires: 1990-07-13
Abstract
Abstract Recovery of silver, polyester and amino acids from processed silver halide gelatin photographic film.
Inventors
- 👤 Eugene Wainer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:00
CPC Classifications
C; C22; C22B; C22B7/00; C22B7/006; C22B11/00; C22B11/04; C22B11/042; C22B11/046; G; G03; G03C; G03C11/00; G03C11/24; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
separating the resulting liquid and suspended silver solids from the stripped base and recovering said base;
Claim 2
Dependent Claim
16 words
The process of claim 1 including, in addition, washing, chopping and subsequently melting the recovered polyester.
Claim 3
Dependent Claim
18 words
filtering the liquid and suspended solids, thereby separating the silver from the liquid, and recovering said silver; and
Claim 4
Dependent Claim
23 words
The process of claim 1 including washing the recovered silver and returning the wash water to the middle compartment of the electrolytic cell.
Claim 5
Dependent Claim
23 words
The process of claim 1 including recirculating the NaOH recovered from the catholyte compartment to strip silver and gelatin from more processed film.
Claim 6
Dependent Claim
31 words
electrolyzing the liquid in a three compartment diaphragm type electrolytic cell and recovering caustic from the catholyte compartment and amino acids from the anolyte compartment, as a result of aid electrolysis.
Claim 7
Dependent Claim
30 words
The process of claim 1 in which caustic is heated to about 80* C. and stripping is effected by immersing processed film in a bath of caustic at 80* C.
References Cited (Backward Citations)
US1350157A
Cited
US1637990A
Cited
US1582847A
Cited
US1669394A
Cited
FR633685A
Cited
GB331006A
Cited
US3330749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |