Patents by Inventor Mario Ishiyama

Mario Ishiyama 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).

  • Process for the preparation of silver halide grains
    Patent number: 5380641
    Abstract: Disclosed is a novel process for the preparation of tabular silver halide grains having parallel twinning planes which comprises the steps of:1) supplying an aqueous solution of a water-soluble silver salt, an aqueous solution of a water-soluble halide and an aqueous solution of a protective colloid into a mixing machine provided external to a reaction vessel where they are mixed to form nuclear grains; and2) introducing the nuclear grains into a ripening vessel comprising a pipe where they are ripened at an elevated temperature.
    Type: Grant
    Filed: June 10, 1993
    Date of Patent: January 10, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigeharu Urabe, Haruyasu Nakatsugawa, Mario Ishiyama