US4672025A
Expired / Lapsed
US
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Method for processing silver halide photographic material
Assignee: Fujifilm Holdings Corp
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Filing: 1985-07-30
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Granted: 1987-06-09
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Expires: 2005-07-30
Abstract
Abstract A silver halide photographic material is developed with an alkaline black-and-white developer comprising (1) hydroquinone, (2) a 3-pyrazolidone-type developing agent, (3) a dialdehyde-type hardener, (4) at least one antifoggant selected from the group consisting of indazole-type antifoggants, benzimidazole-type antifoggants and benzotriazole-type antifoggants, and (5) at least one chelating agent selected from the group consisting of diethylenetriaminepentaacetic acid, triethylenetetraminehexaacetic acid, 1,3-diamino-2-propanoltetraacetic acid, glycol ether diaminetetraacetic acid, ethylenediaminetetramethylenephosphonic acid, aminotrimethylenephosphonic acid and alkali metal salts of said acids.
Inventors
- 👤 Minoru Yamada
- 👤 Takashi Toyoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:19
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/315; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A method for development processing an imagewise exposed silver halide photographic material, comprising developing said material with an alkaline black-and-white developer comprising (1) hydroquinone, (2) a 3-pyrazolidone developing agent, (3) a dialdehyde hardener, (4) at least one antifoggant selected from the group consisting of indazole antifoggants, benzimidazole antifoggants and benzotriazole antifoggants, and (5) at least one chelating agent selected from the group consisting of diethylenetriaminepentaacetic acid, triethylenetetraminehexaacetic acid, and alkali metal salts of said acids, wherein the developer further contains a sulfite, a bisulfite, or a combination thereof, and the molar ratio of the sulfite and bisulfite to hydroquinone is at least about 1.6/1.
Claim 2
Independent Claim
104 words
A method for development processing an imagewise exposed silver halide photographic material, comprising developing said material with an alkaline black-and-white developer comprising (1) hydroquinone, (2) a 3-pyrazolidone developing agent, (3) a dialdehyde hardener, (4) at least one antifoggant selected from the group consisting of indazole antifoggants, benzimidazole antifoggants and benzotriazole antifoggants, and (5) at least one chelating agent selected from the group consisting of diethylenetriaminepentaacetic acid, triethylenetetraminehexaacetic acid, and alkali metal salts of said acids, wherein the developer further contains a sulfite, a bisulfite, or a combination thereof, and the molar ratio of the sulfite and bisulfite to hydroquinone is at least about 1.6/1.
Claim 3
Dependent Claim
36 words
A method as in claim 1, wherein the developer contains a sulfite, a bisulfite, or a combination thereof, and the molar ratio of the sulfite and bisulfite to hydroquinone is from about 1.6/1 to about 3.5/1.
Claim 4
Dependent Claim
36 words
A method as in claim 1, wherein the developer contains a sulfite, a bisulfite, or a combination thereof, and the molar ratio of the sulfite and bisulfite to hydroquinone is from about 1.65/1 to about 2.8/1.
Claim 5
Dependent Claim
26 words
A method as in claim 1, wherein the amount of the chelating agent is from 1×10 -4 to 1×10 -1 mole per liter of the developer.
Claim 6
Dependent Claim
26 words
A method as in claim 2, wherein the amount of the chelating agent is from 1×10 -3 to 1×10 -2 mole per liter of the developer.
Claim 7
Dependent Claim
78 words
A method as in claim 4, wherein the hydroquinone is present in the developer in an amount of from 15 g to 35 g per liter, the 3-pyrazolidone developing agent is present in an amount of from 0.5 g to 2 g per liter, the dialdehyde hardener is present in an amount of from 3 g to 10 g per liter, and the amount of the antifoggant is from 0.1 to 2 mmoles per liter of the developer.
Claim 8
Dependent Claim
78 words
A method as in claim 5, wherein the hydroquinone is present in the developer in an amount of from 15 g to 35 g per liter, the 3-pyrazolidone developing agent is present in an amount of from 0.5 g to 2 g per liter, the dialdehyde hardener is present in an amount of from 3 g to 10 g per liter, and the amount of the antifoggant is from 0.1 to 2 mmoles per liter of the developer.
Claim 9
Dependent Claim
19 words
A method as in claim 1, wherein the silver halide photographic material is a radiographic silver halide photographic material.
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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) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |