Patents by Inventor Masao Ohishi

Masao Ohishi 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).

  • Magnetic-shell-coated toner
    Patent number: 4977053
    Abstract: Disclosured is a toner comprising colored particles and a magnetic shell coated thereon, wherein said colored particles are composed of a binder resin and a coloring agent, and said magnetic shell is formed from an iron-oxide type magnetic material. The toner can be fixable at a low temperature or a low pressure, but the toner particles do not agglomerate with each other during long-term storage.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: December 11, 1990
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Masao Ohishi, Katsuaki Kida, Katsukiyo Ishikawa, Takao Saito, Kouichi Nagata