Patents by Inventor Yoshuhara Nakamura

Yoshuhara Nakamura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Photographic material containing fine silver halide particles and hydroxylamino substituted triazine or pyrimidine sensitizers
    Patent number: 3960568
    Abstract: A silver halide photographic material having increased sensitivity and gradient and being free from fog formation on storage, comprising a support and an emulsion layer containing very fine silver halide grains and containing a nitrogen-containing heterocyclic organic compound having a hydroxylamino group, such as 2-hydroxylamino-4,6-di(ethylamino)-1,3,5-triazine or 2,4-di(hydroxylamino)-6-diethylamino-1,3,5-triazine. The photographic material is useful for recording fine images with a superior sharpness, and the incorporation of the heterocyclic compound increases the sensitivity in spite of the fine grain size of the silver halide.
    Type: Grant
    Filed: November 18, 1975
    Date of Patent: June 1, 1976
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tohru Sueyoshi, Yoshiyuki Nakazawa, Yoshuhara Nakamura, Reiichi Ohi, Tokiharu Kondo