Patent US4040837A successfully refreshed from Google Patents.
US4040837A
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Photographic bleach-fixer
Assignee: Konica Minolta Inc
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Filing: 1975-12-02
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Granted: 1977-08-09
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Expires: 1995-12-02
Abstract
Abstract This invention is directed to a bleach-fix which is stable, excellent in bleach-fix efficiency, applicable to the processing of high-speed, light sensitive silver halide color photographic materials and free from problems of environmental pollution.
Inventors
- 👤 Kenro Sakamoto
- 👤 Isamu Fushiki
- 👤 Sigeharu Koboshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:50
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/42; G03C7/421
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A photographic bleach-fixer comprising per liter 0.1 to 1.5 moles of an organometallic complex salt of an organic acid, selected from the group consisting of ethylenediaminetetraacetic acid, nitrilotriacetic acid, diethylenetriaminepentaacetic acid, 1,2-cyclohexanediaminetetraacetic acid, glycol ether diaminetetraacetic acid, oxybis-(ethyleneoxyethylenenitrilo) tetraacetic acid, oxalic acid and citric acid, coordinated with an ion selected from the group consisting of Iron (III), Cobalt (III) and Copper (II) ion, 0.2 to 2.0 moles of a silver halide-fixing agent, and 0.5 to 7.0 moles of a halide of the general formula: A -- X wherein A is selected from the group consisting of hydrogen, lithium, sodium, potassium and ammonium; and X is selected from the group consisting of bromine and iodine.
Claim 2
Dependent Claim
114 words
A photographic bleach-fixer comprising per liter 0.1 to 1.5 moles of an organometallic complex salt of an organic acid, selected from the group consisting of ethylenediaminetetraacetic acid, nitrilotriacetic acid, diethylenetriaminepentaacetic acid, 1,2-cyclohexanediaminetetraacetic acid, glycol ether diaminetetraacetic acid, oxybis-(ethyleneoxyethylenenitrilo) tetraacetic acid, oxalic acid and citric acid, coordinated with an ion selected from the group consisting of Iron (III), Cobalt (III) and Copper (II) ion, 0.2 to 2.0 moles of a silver halide-fixing agent, and 0.5 to 7.0 moles of a halide of the general formula: A -- X wherein A is selected from the group consisting of hydrogen, lithium, sodium, potassium and ammonium; and X is selected from the group consisting of bromine and iodine.
Claim 3
Dependent Claim
27 words
A photographic bleach-fixer as defined in claim 1 wherein said silver halide-fixing agent is selected from the group consisting of potassium thiosulfate, sodium thiosulfate and ammonium thiosulfate.
Claim 4
Dependent Claim
27 words
A photographic bleach-fixer as defined in claim 1 wherein said silver halide-fixing agent is selected from the group consisting of potassium thiocyanate, sodium thiocyanate and ammonium thiocyanate.
Claim 5
Dependent Claim
15 words
A photographic bleach-fixer as defined in claim 1 wherein said silver halide-fixing agent is thiourea.
Claim 6
Dependent Claim
15 words
A photographic bleach-fixer as defined in claim 1 wherein said silver halide-fixing agent is thioether.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |