Patents by Inventor Sizuo Kuroda

Sizuo Kuroda 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).

  • Dichroic coloring agents for liquid crystal displays
    Patent number: 4883611
    Abstract: Dichroic coloring agents which have a blue to blue-violet hue and have not been used to date for liquid crystal displays are disclosed. These coloring agents are represented by the following formula: ##STR1## wherein X is S or NH; R.sub.1 is a hydrogen atom, halogen atom, alkyl group or alkoxy group; and R.sub.2 is a hydrogen atom, alkyl group, aryl group or aralkyl group.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: November 28, 1989
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Keisuke Takuma, Sizuo Kuroda, Tsukasa Oyama, Hiroshi Aiga