Patent US4284714A successfully refreshed from Google Patents.
US4284714A
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Method of forming a photographic image
Assignee: Fujifilm Holdings Corp
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Filing: 1980-05-09
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Granted: 1981-08-18
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Expires: 2000-05-09
Abstract
Abstract A method is described for forming a black-and-white photographic image consisting essentially of a silver image and a coextensive dye image, in which the maximum density of the image and the fastness of the image to light are greatly improved, by processing a silver halide photosensitive material which contains silver halide in a reduced amount (compared with conventional materials) that has been imagewise exposed to light in the presence of a naphthalene compound containing at least two hydroxy substituents groups on the nucleus thereof and a p-phenylenediamine type developing agent or a precursor of the p-phenylenediamine compound.
Inventors
- 👤 Junkichi Ogawa
- 👤 Mitsugu Tanaka
- 👤 Minoru Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:15
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/30; G03C5/3021
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
A method of forming a photographic image consisting of metallic silver and a dye, comprising imagewise exposing a silver halide photosensitive material to light, development processing said material to form an image in the presence of a naphthalene compound selected from the group consisting of 1,3-, 1,6-2,3-, or 1,7-dihydroxynaphthalene and a p-phenylenediamine type developing agent or a precursor of the p-phenylenediamine compound, and fixing said image.
Claim 2
Independent Claim
66 words
A method of forming a photographic image consisting of metallic silver and a dye, comprising imagewise exposing a silver halide photosensitive material to light, development processing said material to form an image in the presence of a naphthalene compound selected from the group consisting of 1,3-, 1,6-2,3-, or 1,7-dihydroxynaphthalene and a p-phenylenediamine type developing agent or a precursor of the p-phenylenediamine compound, and fixing said image.
Claim 3
Dependent Claim
30 words
A method of forming a photographic image as in claim 1, wherein said dihydroxy naphthalene is substituted with at least one ballast group containing from 8 to 16 carbon atoms.
Claim 4
Dependent Claim
24 words
A method of forming a photograhic image as in claim 1, wherein said development processing is conducted in the presence of a 3-pyrazolidone compound.
Claim 5
Dependent Claim
20 words
A method of forming a photographic image as in claim 3, wherein said 3-pyrazolidone compound is 1-phenyl-4,4-dimethyl-3-pyrazolidone, 1-phenyl-4-methyl-4-hydroxy-methyl-3-pyrazolidone, or 1-phenyl-4,4-dihydroxymethyl-3-pyrazolidone.
Claim 6
Dependent Claim
29 words
A method of forming a photographic image as in claim 1, 2, 3 or 4, wherein said photosensitive material contains from about 0.1 to 7 g Ag/m 2 .
Claim 7
Dependent Claim
37 words
A method of forming a photographic image as in claim 1, 2, 3, or 4, wherein said naphthalene compound is contained in said photosensitive material in an amount of from about 0.1 to 10 g/m 2 .
Claim 8
Dependent Claim
33 words
A method of forming a photographic image as in claim 6, wherein said naphthalene compound is contained in said photosensitive material in an amount from 0.2 g/m 2 to 5 g/m 2 .
Claim 9
Dependent Claim
35 words
A method of forming a photographic image as in claim 1, 2, 3, or 4, wherein said naphthalene compound is contained in the developing solution in an amount of from about 0.1 to 30 g/l.
Claim 10
Dependent Claim
30 words
A method of forming a photographic image as in claim 8, wherein said naphthalene compound is contained in the developing solution in an amount from 0.2 g/l to 20 g/l.
References Cited (Backward Citations)
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |