Patent US4089760A successfully refreshed from Google Patents.
US4089760A
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US
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Method for regenerating waste developers used for processing silver halide photographic materials and method for storing developers
Assignee: Nippon Evr Ltd
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Filing: 1975-08-21
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Granted: 1978-05-16
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Expires: 1995-08-21
Abstract
Abstract A method for regenerating a spent developer used for processing silver halide photographic materials which comprises electrolyzing the spent developer using an electrolytic cell including an ion exchange membrane and composed of a cathode compartment and an anode compartment with the anode and the cathode being separated from each other by an anion exchange membrane, while charging the spent developer into the cathode compartment and an electrolytic solution into the anode compartment.
Inventors
- 👤 Takezo Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:28
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; C; C25; C25C; C25C1/00; C25C1/20; G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/31
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A method for regenerating a waste developer left after processing silver halide photographic materials, which comprises electrolyzing the waste developer using an electrodialytic cell comprising a cathode, an anode and alternating anion exchange membranes and cation exchange membranes arranged therebetween to define a cathode compartment adjacent the anion exchange membrane at one terminal of the cell, a plurality of intermediate enionation and deionation compartments with a set of the deionation compartments alternately disposed between a set of the enionation compartments, and an anode compartment adjacent the cation exchange membrane at the other terminal of the cell; the electrolysis being effected while passing the waste developer through the cathode compartment and charging the effluent from the cathode compartment into the deionation compartments.
Claim 2
Independent Claim
121 words
A method for regenerating a waste developer left after processing silver halide photographic materials, which comprises electrolyzing the waste developer using an electrodialytic cell comprising a cathode, an anode and alternating anion exchange membranes and cation exchange membranes arranged therebetween to define a cathode compartment adjacent the anion exchange membrane at one terminal of the cell, a plurality of intermediate enionation and deionation compartments with a set of the deionation compartments alternately disposed between a set of the enionation compartments, and an anode compartment adjacent the cation exchange membrane at the other terminal of the cell; the electrolysis being effected while passing the waste developer through the cathode compartment and charging the effluent from the cathode compartment into the deionation compartments.
Claim 3
Independent Claim
148 words
A method for regenerating a waste developer left after processing silver halide photographic materials, which comprises first electrolyzing the waste developer by passing it through a cathode compartment of an electrolytic cell comprising a cathode, an anode, and an anion exchange membrane disposed therebetween to define the cathode compartment and an anode compartment; and then electrolyzing the effluent from the cathode compartment of the electrolytic cell by passng it through deionation compartments of an electrodialytic cell comprising a cathode, an anode and alternating anion exchange membranes and cation exchange membranes arranged therebetween to define a cathode compartment adjacent the anion exchange membrane at one terminal of the cell, a plurality of intermediate enionation and deionation compartment with a set of the deionation compartments alternately disposed between a set of the enionation compartments, and an anode compartment adjacent the cation exchange membrane at the other terminal of the cell.
Claim 4
Independent Claim
148 words
A method for regenerating a waste developer left after processing silver halide photographic materials, which comprises first electrolyzing the waste developer by passing it through a cathode compartment of an electrolytic cell comprising a cathode, an anode, and an anion exchange membrane disposed therebetween to define the cathode compartment and an anode compartment; and then electrolyzing the effluent from the cathode compartment of the electrolytic cell by passng it through deionation compartments of an electrodialytic cell comprising a cathode, an anode and alternating anion exchange membranes and cation exchange membranes arranged therebetween to define a cathode compartment adjacent the anion exchange membrane at one terminal of the cell, a plurality of intermediate enionation and deionation compartment with a set of the deionation compartments alternately disposed between a set of the enionation compartments, and an anode compartment adjacent the cation exchange membrane at the other terminal of the cell.
Claim 5
Independent Claim
148 words
A method for regenerating a waste developer left after processing silver halide photograhic materials, which comprises first electrolyzing the waste developer by passing it through a cathode compartment of an electrolytic cell comprising a cathode, an anode, and a cation exchange membrane disposed therebetween to define the cathode compartment and an anode compartment; and then electrolyzing the effluent from the cathode compartment of the electrolytic cell by passing it through dionation compartments of an electrodialytic cell comprising a cathode, an anode and alternating anion exchange membranes and cation exchange membranes arranged therebetween to define a cathode compartment adjacent the anion exchange membrane at one terminal of the cell, a plurality of intermediate enionation and deionation compartments with a set of the deionation compartments alternately disposed between a set of the enionation compartments, and an anode compartment adjacent the cation exchange membrane at the other terminal of the cell.
Claim 6
Independent Claim
148 words
A method for regenerating a waste developer left after processing silver halide photograhic materials, which comprises first electrolyzing the waste developer by passing it through a cathode compartment of an electrolytic cell comprising a cathode, an anode, and a cation exchange membrane disposed therebetween to define the cathode compartment and an anode compartment; and then electrolyzing the effluent from the cathode compartment of the electrolytic cell by passing it through dionation compartments of an electrodialytic cell comprising a cathode, an anode and alternating anion exchange membranes and cation exchange membranes arranged therebetween to define a cathode compartment adjacent the anion exchange membrane at one terminal of the cell, a plurality of intermediate enionation and deionation compartments with a set of the deionation compartments alternately disposed between a set of the enionation compartments, and an anode compartment adjacent the cation exchange membrane at the other terminal of the cell.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |