Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
2005-05-17
2005-05-17
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
C430S546000, C430S549000, C430S551000, C430S552000, C430S955000, C430S567000, C430S506000, C430S569000
Reexamination Certificate
active
06893809
ABSTRACT:
This invention relates to a negative silver halide photographic element comprising a support and a silver halide imaging layer containing a light sensitive silver halide imaging emulsion, said silver halide imaging layer further comprising a separately precipitated non-imaging intentionally fogged fine grain emulsion and an electron transfer agent releasing compound represented by formula (I):in-line-formulae description="In-line Formulae" end="lead"?CAR1-(L)n-ETA (I)in-line-formulae description="In-line Formulae" end="tail"?wherein:CAR1is a carrier moiety which is capable of releasing -(L)n-ETA on reaction with oxidized developing agent;L is a divalent linking group, n is 0, 1 or 2; andETA is a releasable electron transfer agent, and (optionally) a development accelerator releasing compound represented by the formula (II):in-line-formulae description="In-line Formulae" end="lead"?CAR2—(SAM)-NX1—NX2X3 (II)in-line-formulae description="In-line Formulae" end="tail"?wherein:CAR2is a carrier moiety which is capable of releasing —(SAM)-NX1—NX2X3on reaction with oxidized developing agent;SAM is a silver absorbable moiety attached to the carrier moiety and is released on reaction with oxidized development agent; and—NX1—NX2X3is a hydrazine group wherein X1, X2and X3are individually hydrogen or a substituent chosen from alkyl, aryl, carbonyl, or sulfonyl groups with the proviso that at least one of X1, X2and X3is hydrogen.
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Brick Mary C.
Friday James A.
Keevert John E.
Reed Kenneth J.
Singer Stephen P.
Eastman Kodak Company
Letscher Geraldine
Meeks Roberts Sarah
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