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US4128464A
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US
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Process for regenerating bleaching-fixing solution
Assignee: Fujifilm Holdings Corp
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Filing: 1977-02-25
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Granted: 1978-12-05
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Expires: 1997-02-25
Abstract
Abstract A process for electrolytically regenerating a used bleaching-fixing solution resulting from the processing of a color developed color photographic material with a bleaching-fixing solution containing an iron (III) chelate compound and a silver halide solvent, which comprises bubbling an oxygen-containing gas into an anode compartment containing said used bleaching-fixing solution while electrolyzing said used bleaching-fixing solution in an electrolytic cell.
Inventors
- 👤 Yoshio Idota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:30
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/395; G03C5/3954; C; C25; C25C; C25C1/00; C25C1/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A process for electrolytically regenerating a used bleaching-fixing solution resulting from the processing of a color developed color photographic material with a bleaching-fixing solution containing an iron (III) chelate compound and a silver halide solvent in an electrolytic cell comprising anode and cathode compartments separated by a diaphragm wherein the anode is carbon and/or carbon fibers, the cathode potential is -0.40V to -0.55V, the anode potential is 0 to about 0.20V, said potentials being with reference to a standard calomel electrode, and the inter potential is 0.4 to 0.8V; which comprises bubbling an oxygen-containing gas into the anode compartment containing said used bleaching-fixing solution while electrolyzing said used bleaching-fixing solution and; recycling the regenerated solution to a bleach-fixing bath in an electrolytic cell.
Claim 2
Dependent Claim
123 words
A process for electrolytically regenerating a used bleaching-fixing solution resulting from the processing of a color developed color photographic material with a bleaching-fixing solution containing an iron (III) chelate compound and a silver halide solvent in an electrolytic cell comprising anode and cathode compartments separated by a diaphragm wherein the anode is carbon and/or carbon fibers, the cathode potential is -0.40V to -0.55V, the anode potential is 0 to about 0.20V, said potentials being with reference to a standard calomel electrode, and the inter potential is 0.4 to 0.8V; which comprises bubbling an oxygen-containing gas into the anode compartment containing said used bleaching-fixing solution while electrolyzing said used bleaching-fixing solution and; recycling the regenerated solution to a bleach-fixing bath in an electrolytic cell.
Claim 3
Dependent Claim
30 words
The process of claim 1, wherein the amount of the oxygen-containing gas is at least about 0.25 mole per mole of the iron (II) ion in the used bleaching-fixing solution.
Claim 4
Dependent Claim
11 words
The process of claim 1, wherein said oxygen-containing gas is air.
Claim 5
Dependent Claim
16 words
The process of claim 1, wherein the cathode in the electrolytic cell is a rotary cathode.
Claim 6
Dependent Claim
14 words
The process of claim 1, wherein said diaphragm is a microporous synthetic polymer membrane.
Claim 7
Dependent Claim
20 words
The process of claim 1, wherein the average pore size in said diaphragm is about 0.01 to about 1 μ.
Claim 8
Dependent Claim
24 words
The process of claim 1, wherein the current density at the cathode in said electrolytic cell is at least about 0.01 A/dm 2 .
Claim 9
Dependent Claim
21 words
The process of claim 1, wherein said electrolytic cell includes a device containing an activated carbon or an ion exchange resin.
Claim 10
Dependent Claim
16 words
The process of claim 1, wherein the cathode material for the electrolytic cell is stainless steel.
Claim 11
Dependent Claim
54 words
The process of claim 1, wherein said process consists essentially of bubbling said oxygen containing gas into said anode containing compartment while electrolyzing said bleach fixing solution such that the oxidation of iron (II) to iron (III) at the anode is faster than the reduction of iron (III) to iron (II) at the cathode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |