US3941601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide material which contains color couplers
Assignee: Agfa Gevaert AG
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Filing: 1974-12-09
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Granted: 1976-03-02
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Expires: 1994-12-09
Abstract
Abstract This invention relates to a color photographic material with at least one silver halide emulsion layer having improved stability against crystallization and which contains in dispersed form a open chain keto methylene coupler a naphtholic or pyrazolone color coupler substituted with a 2-cyclo-pentyl-4-t-butyl-phenoxy group in a non-coupling position.
Inventors
- 👤 Willibald Pelz
- 👤 Hans-Heinrich Credner
- 👤 Walter Schulte
- 👤 Alfons Klein
- 👤 Karlfried Wedemeyer
- 👤 Fritz Nittel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:25
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3212
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A color photographic gelatin silver halide emulsion having improved stability against crystallization characterized in that it contains in an organic solvent an effective amount of a color coupler of the following formula: ##SPC9## in which K represents a radical with color coupling properties selected from the group consisting of α-naphthol, pyrazolene-5 or open-chain ketomethylene groups; V represents a connecting link which links the 2-cyclopentyl-4-t.-butyl-phenoxy group with the coupler radical, selected from the group consisting of a --NH--(CH 2 ) n and a ##EQU2## and a --CO--O--(CH 2 ) 2 group; R 1 represents hydrogen or an alkyl radical preferably with up to 12 carbon atoms; and n equals an integer, preferably 2, 3 or 4.
Claim 2
Dependent Claim
115 words
A color photographic gelatin silver halide emulsion having improved stability against crystallization characterized in that it contains in an organic solvent an effective amount of a color coupler of the following formula: ##SPC9## in which K represents a radical with color coupling properties selected from the group consisting of α-naphthol, pyrazolene-5 or open-chain ketomethylene groups; V represents a connecting link which links the 2-cyclopentyl-4-t.-butyl-phenoxy group with the coupler radical, selected from the group consisting of a --NH--(CH 2 ) n and a ##EQU2## and a --CO--O--(CH 2 ) 2 group; R 1 represents hydrogen or an alkyl radical preferably with up to 12 carbon atoms; and n equals an integer, preferably 2, 3 or 4.
Claim 3
Independent Claim
148 words
The method of producing a color photographic gelatin silver halide emulsion layer in a photographic material on a support to improve the mixing of a color coupler in the silver halide emulsion which comprises the step of emulsifying with a gelatin solution, a solution of an organic solvent and a color coupler of the following formula: ##SPC10## in which K represents a radical with color coupling properties selected from the group consisting of α-naphthol, pyrazolone-5 or open-chain ketomethylene groups; V represents a connecting link which links the 2-cyclopentyl-4-t.-butyl-phenoxy group with the coupler radical, selected from the group consisting of a --NH--(CH 2 ) n and a ##EQU3## and a CO--O--(CH 2 ) 2 group; R 1 represents hydrogen or an alkyl radical preferably with up to 12 carbon atoms; and n equals an integer, preferably 2, 3 or 4 and subsequently applying the resultant emulsion on a support.
Claim 4
Independent Claim
148 words
The method of producing a color photographic gelatin silver halide emulsion layer in a photographic material on a support to improve the mixing of a color coupler in the silver halide emulsion which comprises the step of emulsifying with a gelatin solution, a solution of an organic solvent and a color coupler of the following formula: ##SPC10## in which K represents a radical with color coupling properties selected from the group consisting of α-naphthol, pyrazolone-5 or open-chain ketomethylene groups; V represents a connecting link which links the 2-cyclopentyl-4-t.-butyl-phenoxy group with the coupler radical, selected from the group consisting of a --NH--(CH 2 ) n and a ##EQU3## and a CO--O--(CH 2 ) 2 group; R 1 represents hydrogen or an alkyl radical preferably with up to 12 carbon atoms; and n equals an integer, preferably 2, 3 or 4 and subsequently applying the resultant emulsion on a support.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |