The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1992
Filed:
Jun. 20, 1990
Sumito Yamada, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A process for treating a tabular silver halide emulsion is disclosed comprising the steps of subjecting the tabular silver halide emulsion to reduction sensitization and to sulfur sensitization or selenium sensitization and/or gold sensitization in the presence of a nitrogen-containing heterocyclic compound which forms a complex with silver during the manufacture of the tabular silver halide emulsion, said tabular emulsion having a grain size distribution such that grains having an average aspect ratio of not lower than 3.0 constitute at least 50% of the total projected area of all of the silver halide grains. There is also disclosed a silver halide X-ray photographic material comprising a support having thereon at least one silver halide emulsion layer containing a tabular silver halide emulsion prepared in accordance with the above process.