Patents by Inventor Kazumi Minahara

Kazumi Minahara 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 containing photographic yellow coupler
    Patent number: 4008086
    Abstract: An improved photographic system in which a new yellow coupler is employed. The yellow coupler has the formula, ##STR1## wherein X is a --N= or --CH= group; Cp is a residue formed by removing one hydrogen atom of the active methylene group of an acetanilide yellow coupler; n is an integer of 1 to 4; and R is a hydrogen or halogen atom, or an alkyl, alkoxy, alkylcarbonyl, aryl, arylcarbonyl, amino, acylamino, carboxyl, nitrile, aralkyl or aralkyloxy group, provided that in case n is 2 or more the R groups may be the same or different, and two adjacent R groups in combination may form a benzene ring.
    Type: Grant
    Filed: May 16, 1975
    Date of Patent: February 15, 1977
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Wataru Fujimatsu, Shui Sato, Tamotsu Kojima, Takaya Endo, Kazumi Minahara