US4769312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of processing silver halide color photographic material including the use of a two bath desilvering system comprising two baths
Assignee: Fujifilm Holdings Corp
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Filing: 1986-10-14
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Granted: 1988-09-06
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Expires: 2006-10-14
Abstract
Abstract A method of processing silver halide color photographic materials which comprises image-wise exposing said silver halide color photographic materials, color developing and then desilvering them in a bath having bleaching ability, characterized in that the bath having bleaching ability comprises two baths, the oxidation-reduction potential of the first bath being higher than that of the second bath, the oxidation-reduction potential of the second bath falling in the range of +60 mV to -60 mV, the first bath containing a water-soluble bromide in an amount of 0.5 to 1.3 mole/l, and the second bath containing a water-soluble bromide in an amount of 0 to 0.5 mole/l.
Inventors
- 👤 Shinzo Kishimoto
- 👤 Akira Abe
- 👤 Junya Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:29
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/42
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
111 words
A method of processing a silver halide color photographic material which comprises (i) image-wise exposing said silver halide color photographic material, (ii) color developing said material, and (iii) then desilvering said material in a bath having bleaching ability, wherein the bath having bleaching ability comprises two baths, the oxidation-reduction potential of the first bath being higher than that of the second bath, the oxidation-reduction potential of the second bath falling in the range of + 60 mV to -60 mV, the first bath containing a water-soluble bromide in an amount of 0.5 to 1.3 mole/l, and the second bath containing a water-soluble bromide in an amount of 0 to 0.5 mole/l.
Claim 2
Independent Claim
111 words
A method of processing a silver halide color photographic material which comprises (i) image-wise exposing said silver halide color photographic material, (ii) color developing said material, and (iii) then desilvering said material in a bath having bleaching ability, wherein the bath having bleaching ability comprises two baths, the oxidation-reduction potential of the first bath being higher than that of the second bath, the oxidation-reduction potential of the second bath falling in the range of + 60 mV to -60 mV, the first bath containing a water-soluble bromide in an amount of 0.5 to 1.3 mole/l, and the second bath containing a water-soluble bromide in an amount of 0 to 0.5 mole/l.
Claim 3
Dependent Claim
24 words
The method of claim 1, wherein the difference in the oxidation-reduction potential between the first and the second baths is 20 mV or higher.
Claim 4
Dependent Claim
24 words
The method of claim 1, wherein the difference in the oxidation-reduction potential between the first and the second baths is 40 mV or higher.
Claim 5
Dependent Claim
21 words
The method of claim 1, wherein the first bath contains the water-soluble bromide in an amount of 0.7 to 1.3 mole/l.
Claim 6
Dependent Claim
33 words
The method of claim 1, wherein the water-soluble bromide is selected from the group consisting of ammonium bromide, potassium bromide, sodium bromide, lithium bromide, hydrobromic acid, magnesium bromide, calcium bromide and strontium bromide.
Claim 7
Dependent Claim
21 words
The method of claim 1, wherein the second bath contains a water-soluble bromide in an amount of 0.1 to 0.5 mole/l.
Claim 8
Dependent Claim
21 words
The method of claim 1, wherein the second bath contains a water-soluble bromide in an amount of 0.2 to 0.5 mole/l.
Claim 9
Dependent Claim
41 words
The method of claim 1, wherein the bath having bleaching ability contains a bleaching agent selected from the group consisting of ferric complex salts of ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, cyclohexanediamine tetraacetic acid, 1,2-diaminopropane tetraacetic acid, and methylimino diacetic acid.
Claim 10
Dependent Claim
15 words
The method of claim 1, wherein the bath having bleaching ability contains a bleach accelerator.
Claim 11
Dependent Claim
36 words
The method of claim 9, wherein the bleach accelerator is selected from the group consisting of a compound having a mercapto group or a disulfide bond, a thiazolidine derivatie, a thiourea derivative and an isothiourea derivative.
Claim 12
Dependent Claim
21 words
The method of claim 9, wherein the bleach accelerator is contained in an amount of 1×10 -5 to 10 -1 mole/l.
Claim 13
Dependent Claim
18 words
The method of claim 1, wherein the bath having bleaching ability has a pH of 0.5 to 9.0.
Claim 14
Dependent Claim
32 words
The method of claim 1, wherein the processing time in the first bath is 20 seconds to 4 minutes, and the processing time in the second bath is 1 to 6 minutes.
Claim 15
Dependent Claim
112 words
The method of claim 1, wherein said color photographic material contains a cyan coupler represented by the formula (X) or (XI). ##STR14## wherein R 1 , R 2 , and R 4 represent a substituted or non-substituted aliphatic hydrocarbyl, aryl or heterocyclic group, R 3 and R 6 represent hydrogen atom, halogen atom, a substituted or non-substituted aliphatic, aryl or acylamino group, or R 3 represent a non-metallic atom group necessary for forming a 5- or 6-membered nitrogen-containing ring together with R 2 , R 5 represents an alkyl group which may be substituted, and Z 1 and Z 2 represent hydrogen atom or a group which splits off upon coupling reaction.
Claim 16
Dependent Claim
19 words
The method of claim 1, wherein solution overflows from the first bath and is introduced into the second bath.
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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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |