Patents by Inventor Konica Ohashi

Konica Ohashi 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).

  • Silver halide emulsion chemically ripened in the presence of a gold-containing complex
    Patent number: 5198331
    Abstract: A method for preparing a silver halide emulsion containing silver halide grains comprising(i) preparing a mixture by mixing a compound represented by the following Formula (1) or (2), and a gold compound; and(ii) performing chemical ripening of the emulsion by adding said mixture thereto: ##STR1## wherein M, R, V and W independently represent a hydrogen atom or a substituent group; V and W may combine with each other to form a ring.
    Type: Grant
    Filed: July 3, 1991
    Date of Patent: March 30, 1993
    Assignee: Konica Corporation
    Inventors: Hideki Takiguchi, Tomoyuki Nakayama, Nobuaki Kagawa, Konica Ohashi