Patents by Inventor Hidetaka Ninomiya

Hidetaka Ninomiya 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).

  • Method for synthesizing a magenta coupler by selectively etherifying 4-hydroxy-5-pyrazolone
    Patent number: 4692529
    Abstract: A method for synthesizing a magenta coupler. The synthesis is carried out through (1) 3-pyrazoline-5-ones which are obtained by substituting a blocking group at the nitrogen atom in the second position thereof; or (2) pyrazoles which are obtained by substituting a blocking group at the hydroxyl group bonded in the fifth position thereof. The magenta coupler obtained has the formula ##STR1## wherein R.sub.1 is an aryl or heterocyclic group, R.sub.2 is an acylamide, anilino or ureido group, and R3 is an alkyl, aryl, or heterocyclic group.
    Type: Grant
    Filed: November 10, 1983
    Date of Patent: September 8, 1987
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Kasaku Masuda, Ryosuke Sato, Fumio Ishii, Kazuhiko Kimura, Hidetaka Ninomiya
  • Silver halide photographic material
    Patent number: 4324856
    Abstract: A photographic silver halide material is disclosed which contains a precursor of photographic chemicals.
    Type: Grant
    Filed: October 7, 1980
    Date of Patent: April 13, 1982
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Satoshi Kawakatsu, Shigeto Hirabayashi, Hidetaka Ninomiya, Yutaka Kaneko
  • Photographic material
    Patent number: 4297441
    Abstract: This invention relates to photographic materials containing an ion pair compound which has a quaternary nitrogen atom as a cation and a boron compound as an anion.
    Type: Grant
    Filed: June 26, 1980
    Date of Patent: October 27, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Yutaka Kaneko, Satoshi Kawakatsu, Shigeto Hirabayashi, Hidetaka Ninomiya
  • Processing method of silver halide color photographic material
    Patent number: 4297437
    Abstract: A method for processing an exposed color photographic material containing a color developing agent or precursor by developing with a color developer which is replenished.
    Type: Grant
    Filed: November 24, 1980
    Date of Patent: October 27, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Yutaka Kaneko, Shigeto Hirabayashi, Satoshi Kawakatsu, Hidetaka Ninomiya