Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
2005-11-29
2005-11-29
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S604000, C430S605000
Reexamination Certificate
active
06969582
ABSTRACT:
A silver halide emulsion comprising radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure containing a hexacoordination complex of an iridium ion in which at least half of the coordination sites in the hexacoordination complex are provided by halogen or pseudohalogen ligands, and at least one coordination site is provided by a ligand comprising a azole ring containing a chalcogen atom and a nitrogen atom, wherein the azole ring is substituted at the 5-position with a halide ion. The invention provides emulsions containing with a preferred class of iridium dopants which are especially useful for improving reciprocity performance in silver halide emulsions with minimal or no impact on other aspects of photographic performance. These dopants give a superior balance of reciprocity and other photographic properties compared to other iridium dopants exemplified in the prior art.
REFERENCES:
patent: 5360712 (1994-11-01), Olm et al.
patent: 5457021 (1995-10-01), Olm et al.
patent: 5462849 (1995-10-01), Kuromoto et al.
patent: 6107018 (2000-08-01), Mydlarz et al.
Bell Eric L.
Hansen Jeffrey C.
Lewis John D.
McDugle, Jr. Woodrow G.
Mydlarz Jerzy Z.
Anderson Andrew J.
Eastman Kodak Company
Letscher Geraldine
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