Patents by Inventor Karumi Kakigawa

Karumi Kakigawa 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).

  • Toner for developing latent electrostatic images
    Patent number: 4908290
    Abstract: A toner for developing latent electrostatic images is disclosed, which comprises a colorant, and a binder agent comprising (i) polyester resin or epoxy resin, and (ii) styrene - methyl acrylate copolymer.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: March 13, 1990
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoichiro Watanabe, Mitsuo Aoki, Tetsuo Isoda, Nobuhiro Nakayama, Fumihiro Sasaki, Karumi Kakigawa