US4444873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic processing
Assignee: Fujifilm Holdings Corp
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Filing: 1982-12-29
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Granted: 1984-04-24
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Expires: 2002-12-29
Abstract
Abstract A process for processing a silver halide color photographic material is disclosed. The process particularly relates to bleaching and fixing of a color developed silver halide color photographic material. The color developed material is processed with an acid bleaching solution containing a ferric salt, inorganic salt and a halide. Immediately after the bleaching step, the photographic material is processed with the fixing solution containing 5 g/l to 50 g/l of polycarboxylic acids. By utilizing the bleaching and fixing steps disclosed it is possible to process a silver halide color photographic material rapidly utilizing a reduced number of baths, obtain an excellent bleaching rate and produce an image having excellent stability.
Inventors
- 👤 Takatoshi Ishikawa
- 👤 Kiyoshi Imai
- 👤 Mamoru Tashiro
- 👤 Junya Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:49
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/42; G03C7/421
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
55 words
A process for bleaching and fixing a color developed silver halide color photographic material, comprising the steps of: processing the photographic material with an acid bleaching solution containing a ferric salt, an organic acid and a halide; and processing the bleached photographic material with a fixing solution containing 5g/l to 50 g/l of polycarboxylic acids.
Claim 2
Dependent Claim
55 words
A process for bleaching and fixing a color developed silver halide color photographic material, comprising the steps of: processing the photographic material with an acid bleaching solution containing a ferric salt, an organic acid and a halide; and processing the bleached photographic material with a fixing solution containing 5g/l to 50 g/l of polycarboxylic acids.
Claim 3
Dependent Claim
29 words
A process for bleaching and fixing as claimed in claim 1, wherein the ferric salt is selected from the group consisting of ferric chloride, ferric bromide and ferric citrate.
Claim 4
Dependent Claim
27 words
A process for bleaching and fixing as claimed in claim 2, wherein the ferric salt is selected from the group consisting of ferric chloride and ferric bromide.
Claim 5
Dependent Claim
26 words
A process for bleaching and fixing as claimed in claim 1, wherein the organic acid is selected from the group consisting of water-soluble aliphatic carboxylic acids.
Claim 6
Dependent Claim
29 words
A process for bleaching and fixing as claimed in claim 4, wherein the organic acid is selected from the group consisting of citric acid and the water-soluble salts thereof.
Claim 7
Dependent Claim
31 words
A process for bleaching and fixing as claimed in claim 1, wherein the ferric salts are present in an amount of 10 g to 400 g per liter of bleaching solution.
Claim 8
Dependent Claim
31 words
A process for bleaching and fixing as claimed in claim 1, wherein the organic acid is present in an amount of 5 g to 300 g per liter of bleaching solution.
Claim 9
Dependent Claim
30 words
A process for bleaching and fixing as claimed in claim 1, wherein the halide is present in an amount of 2 g to 200 g per liter of bleaching solution.
Claim 10
Dependent Claim
69 words
A process for bleaching and fixing as claimed in claim 1, wherein the ferric salt is present in an amount of 20 g to 300 g per liter of bleaching solution, the organic acid is present in an amount of 10 g to 100 g per liter of bleaching solution and the halide is present in an amount of 5 g to 100 g per liter of bleaching solution.
Claim 11
Dependent Claim
22 words
A process for bleaching and fixing as claimed in claim 1, wherein the bleaching solution has a pH of 3 or less.
Claim 12
Dependent Claim
22 words
A process for bleaching and fixing as claimed in claim 10, wherein the bleaching solution has a pH of 1 or less.
Claim 13
Dependent Claim
24 words
A process for bleaching and fixing as claimed in claim 1, wherein the fixing solution contains 10 g/l to 40 g/l of polycarboxylic acids.
Claim 14
Dependent Claim
38 words
A process for bleaching and fixing as claimed in claim 1, wherein the polycarboxylic acid is selected from the group consisting of ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, ethylenediamine-N-(β-oxyethyl)-N,N', N'-triacetic acid and propylenediaminetetraacetic acid, and sodium and potassium salts thereof.
Claim 15
Dependent Claim
25 words
A process for bleaching and fixing as claimed in claim 1, wherein the fixing solution has a pH within the range of 5 to 9.
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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |