Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
2005-03-08
2005-03-08
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S966000, C430S502000, C430S604000, C430S605000, C430S139000, C430S574000
Reexamination Certificate
active
06864045
ABSTRACT:
A radiographic silver halide film comprises a cubic grain silver halide emulsion layer on one side of the support and a tabular grain silver halide emulsion layer on the other side. The cubic grain silver halide emulsion layer comprises a combination of first and second spectral sensitizing dyes that provides a combined maximum J-aggregate absorption on the cubic silver halide grains of from about 540 to about 560 nm. The first spectral sensitizing dye is an anionic benzimidazole-benzoxazole carbocyanine, the second spectral sensitizing dye is an anionic oxycarbocyanine. The cubic grain silver halide emulsion layer also includes a mixture of gelatin or a gelatin derivative and a second hydrophilic binder other than gelatin or a gelatin derivative at a weight ratio of first to second hydrophilic binder of from about 2:1 to about 5:1. The cubic silver halide grains comprise from about 1 to about 20 mol % chloride and from about 0.25 to about 1.5 mol % iodide, which cubic silver halide grains have an average ECD of from about 0.65 to about 0.8 μm. Moreover, the cubic silver halide grains are doped with a hexacoordination complex compound within part or all of the innermost 95% of the grains. These films can be exposed to provide a black-and-white image having a d(γ)/d(log E) value greater than 5 and are particularly useful when imaged using X-radiation generating devices comprising rhodium or tungsten anodes.
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U.S. Appl. No. 10/299,123, filed on even date herewith, titledRadiographic Silver Halide Film for Mammography With Reduced Dye Stain, by Adin et al. CIP 10/440,749.
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Dickerson Robert E.
Moore William E.
Steklenski David J.
Letscher Geraldine
Tucker J. Lanny
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