US4562144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image stabilizer for silver halide photographic material
Assignee: Konica Minolta Inc
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Filing: 1984-10-17
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Granted: 1985-12-31
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Expires: 2004-10-17
Abstract
Abstract An image stabilizer for silver halide photographic materials which contains a water-soluble bismuth compound is disclosed. In a preferred embodiment, the stabilizer also contains a water soluble chelating agent capable of forming a bismuth complex or its salt having a stability constant (log KMA) of 3 or more, said constant being represented by formula (I): ##EQU1## wherein M is a bismuth ion and A is a complex forming anion. By using this stabilizer, the processed dye image is kept stable over an extended period and the occurrence of yellow stain in the non-image area is inhibited. The stabilizer is applicable not only to color photographic materials but also to black-and-white materials.
Inventors
- 👤 Masayuki Kurematsu
- 👤 Shigeharu Koboshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:50
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3046; G03C5/00; G03C5/26; G03C5/268
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
37 words
A method of treating an exposed silver halide photographic material, after bleaching or bleach-fixing, comprising the step of treating said photographic material containing a dye image with an aqueous stabilizing solution which contains a water-soluble bismuth compound.
Claim 2
Independent Claim
37 words
A method of treating an exposed silver halide photographic material, after bleaching or bleach-fixing, comprising the step of treating said photographic material containing a dye image with an aqueous stabilizing solution which contains a water-soluble bismuth compound.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein said water-soluble bismuth compound is a bismuth complex or its salt chelated with a water-soluble chelating agent.
Claim 4
Dependent Claim
44 words
A method according to claim 2, wherein said bismuth complex or its salt has a stability constant (log KMA) of 3 or more, said constant being represented by formula (I): ##EQU3## wherein M is a bismuth ion and A is a complex forming anion.
Claim 5
Dependent Claim
43 words
A method according to claim 2, wherein said water-soluble chelating agent is at least one compound selected from the group consisting of aminopoly carboxylic acids, aminophosphonic acids, organic phosphonic acids, phosphonocarboxylic acids, poly carboxylic acids, organic sulfonic acids and condensed phosphonic acid salts.
Claim 6
Dependent Claim
39 words
A method according to claim 1, wherein said water-soluble bismuth compound is a complex with at least one compound selected from the group consisting of diethylenetriaminopentaacetic acid, hydroxyethyliminodiacetic acid, 1- hydroxyethylidene-1,1-diphosphonic acid, condensed salts thereof and phosphonic acid salts.
Claim 7
Dependent Claim
23 words
A method according to claim 1, wherein said aqueous stabilizing solution contains a water-soluble chelating agent in addition to said water-soluble bismuth compound.
Claim 8
Dependent Claim
53 words
A method according to claim 6, wherein said water-soluble chelating agent is one capable of forming a bismuth complex or its salt having a stability constant (log KMA) of 3 or more, said constant being represented by formula (I): ##EQU4## wherein M is a bismuth ion and A is a complex forming anion.
Claim 9
Dependent Claim
27 words
A method according to claim 1, wherein said water-soluble bismuth compound is used in an amount of 0.001 to 100 g per liter of the aqueous solution.
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) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |