Patents by Inventor Kasaku Masuda

Kasaku Masuda 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