Patent US3820997A successfully refreshed from Google Patents.
US3820997A
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Method of color development processing for forming stable photographic images
Assignee: Fujifilm Holdings Corp
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Filing: 1972-10-12
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Granted: 1974-06-28
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Expires: 1992-10-12
Abstract
Abstract In a color development process for forming stable photographic images by color-developing and bleach-fixing a silver halide color photographic material containing one or more couplers, the improvement which further comprises processing the material with an oxidizing solution containing 0.3 - 3 g/liter of a ferricyanide complex salt. Preferably this processing is followed by processing in a solution containing a reducing compound. The solutions used are also set out in detail.
Inventors
- 👤 K Shirasu
- 👤 T Hatano
- 👤 H Iwano
- 👤 I Shimamura
- 👤 M Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:37
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3046
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
25 words
The process as claimed in claim 1, wherein said oxidizing solution further contains persulfuric acid, chlorous acid, chloric acid or an alkali metal salt thereof.
Claim 2
Dependent Claim
7 words
M2S2O4 (wherein M is as defined above),
Claim 3
Dependent Claim
7 words
M2S2O4 (wherein M is as defined above),
Claim 4
Dependent Claim
7 words
M2SO3 (wherein M is as defined above),
Claim 5
Dependent Claim
7 words
M2SO3 (wherein M is as defined above),
Claim 6
Dependent Claim
21 words
The process as claimed in claim 1 wherein said oxidizing solution further contains an alkali metal halide or an ammonium halide.
Claim 7
Dependent Claim
19 words
The process of claim 2 wherein said oxidizing solution further contains an alkali metal halide or an ammonium halide.
Claim 8
Dependent Claim
17 words
R-SO2-R1 (wherein R and R1 represent NH2, NHR2 or NR2R3, R2 and R3 being lower alkyl), 5.
Claim 9
Dependent Claim
17 words
R-SO2-R1 (wherein R and R1 represent NH2, NHR2 or NR2R3, R2 and R3 being lower alkyl), 5.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein the oxidizing solution is at a pH of from about 3 to about 10.
Claim 11
Dependent Claim
85 words
In a color development process for forming stable photographic images, which comprises color-developing with a developer containing a non-colored leuco dye compound and bleach-fixing in the absence of a ferricyanide complex salt, a silver halide color photographic material containing one or more couplers, the improvement comprising then processing the material with an oxidizing solution containing 0.3 - 3g/liter of a ferricyanide complex salt to thereby oxidize and color substantially all the non-colorEd leuco dye compound and then processing with a solution of a reducing compound.
Claim 12
Dependent Claim
15 words
R7-SO2M (wherein R7 represents aryl or substituted aryl, and M represents a monovalent metal), 7.
Claim 13
Dependent Claim
15 words
R7-SO2M (wherein R7 represents aryl or substituted aryl, and M represents a monovalent metal), 7.
Claim 14
Dependent Claim
24 words
The process of claim 6 where the reducing compound has an oxidation potential not greater than 100 mV based on a saturated calomel electrode.
Claim 15
Dependent Claim
23 words
The process of claim 6 wherein the solution of reducing compound contains less than 15 g of reducing compound per liter of solution.
Claim 16
Dependent Claim
16 words
HONR11R12 (wherein R11 and R12 represent H, lower alkyl or lower alkoxyalkyl, or a salt thereof),
Claim 17
Dependent Claim
16 words
HONR11R12 (wherein R11 and R12 represent H, lower alkyl or lower alkoxyalkyl, or a salt thereof),
Claim 18
Dependent Claim
10 words
polycarboxylic acids or salts thereof with a monovalent metal, and
Claim 19
Dependent Claim
9 words
polycarboxylic acids or salts thereof with monovalent metal, and
Claim 20
Dependent Claim
17 words
A method as described in claim 6, wherein said reducing agent is selected from the following compounds:
Claim 21
Dependent Claim
1 words
thioacetamide.
Claim 22
Dependent Claim
113 words
In a color development processing for forming stable photographic images which comprises (1) developing a silver halide color photographic material containing one or more couplers with a developer containing an aromatic primary amine developing agent to form color image, a non-colored leuco dye compound and developed silver, (2) processing with a bleach-fixing solution in the absence of a ferricyanide complex salt to remove developed silver and residual silver salt, the improvement comprising then: (3) processing with an oxidizing processing solution containing 0.3 - 3 g/liter of a ferricyanide complex salt to thereby oxidize and color substantially all the non-colored leuco dye compound, and then (4) processing with a solution of a reducing compound.
Claim 23
Dependent Claim
1 words
thioacetamide.
Claim 24
Dependent Claim
24 words
The process of claim 10 where the reducing compound has an oxidation potential not greater than 100 mV based on a saturated calomel electrode.
Claim 25
Dependent Claim
17 words
A method as described in claim 10, wherein said reducing agent is selected from the following compounds:
Claim 26
Dependent Claim
23 words
The process of claim 10 wherein the solution of reducing compound contains less than 15 g of reducing compound per liter of solution.
Claim 27
Dependent Claim
24 words
The process of claim 1 where the bleach-fixing solution contains at least one of an iron(III) complex salt, a cobalt(III) complex salt or quinone.
Claim 28
Dependent Claim
24 words
The process of claim 6 where the bleach-fixing solution contains at least one of an iron(III) complex salt, a cobalt(III) complex salt or quinone.
Claim 29
Dependent Claim
24 words
The process of claim 10 where the bleach-fixing solution contains at least one of an iron(III) complex salt, a cobalt(III) complex salt or quinone.
Claim 30
Dependent Claim
38 words
The process of claim 1 where the bleach-fixing is with a solution comprising from about 50 to about 300 g/liter of an oxidizing agent and from about 1 to about 300 g/liter of a silver halide fixing agent.
Claim 31
Dependent Claim
38 words
The process of claim 6 where the bleach-fixing is with a solution comprising from about 50 to about 300 g/liter of an oxidizing agent and from about 1 to about 300 g/liter of a silver halide fixing agent.
Claim 32
Dependent Claim
38 words
The process of claim 10 where the bleach-fixing is with a solution comprising from about 50 to about 300 g/liter of an oxidizing agent and from about 1 to about 300 g/liter of a silver halide fixing agent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |