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US4266014A Expired / Lapsed US ⏱️ 0.0 years remaining

Photographic materials containing light absorbing methine dyes

Assignee: Agfa Gevaert NV
•
Filing: 1980-02-15
•
Granted: 1981-05-05
•
Expires: 2000-02-15
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Abstract

Abstract Light-absorbing fluorine-containing 2-pyrazolin-5-one methine oxonol dyes corresponding to the formula ##STR1## wherein R is C 1 -C 5 alkyl, aryl, alkoxycarbonyl, carboxy, or carbamoyl, and n is 0, 1, or 2. The dyes can be used in light-sensitive silver halide materials in an antihalation layer, in a filter layer or as screening dyes in a light-sensitive layer. They manifest great stability while in dissolved state within a very large pH-range and they are decolorized easily in one of the processing baths. They are prepared by joining 2 appropriately substituted pyrazolone rings in 4-position by 1 methine group through reaction with an ester of an orthocarboxylic acid or by a tri- or pentamethine group through reaction with β-anilinoacrolein anil HCl or glutaconic dialdehyde dianil HCl respectively.

Inventors

  • 👤 Felix J. Moelants
  • 👤 Henri Depoorter

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 18:14
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832; C; C09; C09B; C09B23/00; C09B23/02

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 55 words
A light-sensitive photographic material containing a light-absorbing dye corresponding to the following general formula: ##STR12## wherein: R represents a C 1 -C 5 alkyl group, an aryl group or a substituted aryl group, an alkoxycarbonyl group, a carboxy group, or a carbamoyl group, and n is 0, 1, or 2 and a silver halide emulsion.
Claim 2
Dependent Claim 55 words
A light-sensitive photographic material containing a light-absorbing dye corresponding to the following general formula: ##STR12## wherein: R represents a C 1 -C 5 alkyl group, an aryl group or a substituted aryl group, an alkoxycarbonyl group, a carboxy group, or a carbamoyl group, and n is 0, 1, or 2 and a silver halide emulsion.
Claim 3
Dependent Claim 24 words
A material according to claim 1, comprising a support, at least one light-sensitive silver halide emulsion layer and a layer containing said light-absorbing dye.
Claim 4
Dependent Claim 34 words
A material according to claim 2, wherein the layer containing said light-absorbing dye is a hydrophilic colloid antihalation layer coated at the side of the support that carries the light-sensitive silver halide emulsion layer(s).
Claim 5
Dependent Claim 48 words
A material according to claim 2, wherein the support is a film support and the layer containing said light-absorbing dye is an antihalation layer coated at the side of the support opposite to that carrying the light-sensitive silver halide emulsion layer(s) and containing a water-insoluble, alkali-soluble polymeric binder.
Claim 6
Dependent Claim 45 words
A material according to claim 2, wherein the layer containing said light-absorbing dye is a colloid filter layer of a light-sensitive photographic multi-layer material shielding at least one typically sensitized silver halide emulsion layer from the light of the wavelength absorbed by said light-absorbing dye.
Claim 7
Dependent Claim 20 words
A material according to claim 2, wherein the layer containing said light-absorbing dye is a light-sensitive silver halide emulsion layer.

References Cited (Backward Citations)

US3512983A Cited
US3865817A Cited
US3876429A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-05-04 1984-11-03 1985-05-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-05-04 1988-11-03 1989-05-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-05-04 1992-11-03 1993-05-05 $7700.00 Window Closed / Lapsed

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