Patents by Inventor Takumi Hirosawa

Takumi Hirosawa 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).

  • Colored polypropylene resin
    Patent number: 4826898
    Abstract: A colored polypropylene resin comprising a polypropylene resin, a carbon black pigment and a copper phthalocyanine pigment, said colored polypropylene resin further comprising 0.
    Type: Grant
    Filed: March 29, 1988
    Date of Patent: May 2, 1989
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Takumi Hirosawa, Yuzo Hirayama, Keiki Sagara, Mituhiro Isomichi, Junichi Kumabe