Patents by Inventor Kenzi Kitamura

Kenzi Kitamura 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).

  • Azo dispersing agents and azo pigment compositions
    Patent number: 5051131
    Abstract: An azo pigment composition which forms a dispersion having high tinting strength and excellent clearness, transparency, fluidity and storage stability, and which is formed from a coupling reaction between a diazo component and a coupler component, and contains a compound represented by formula (I) ##STR1## wherein Q represents a diazo or coupler component moiety, A represents a divalent bonding group selected from a class consisting of --CONR'--, SO.sub.2 NR'--, --CH.sub.2 NH-- and --CH.sub.2 NHCOCH.sub.2 NH-- in which R' represents a hydrogen atom, alkyl group having 1 to 20 carbon atoms or aryl group,each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents a hydrogen atom, alkyl group having 1 to 20 carbon atoms or alkenyl group having 2 to 20 carbon atoms, and R.sub.3 and R.sub.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: September 24, 1991
    Assignee: Toyo Ink Manufacturing Co., Ltd.
    Inventors: Takahiro Yuasa, Kenzi Kitamura