Patents by Inventor Yukako Oya

Yukako Oya 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 electrophotography and method for producing the same
    Patent number: 5318871
    Abstract: A toner for electrophotography obtained by melting and kneading a kneaded material prepared by melting and kneading a domain resin and a coloring agent, a matrix resin having a low compatibility with the domain resin, and a dispersion assistant having a compatibility with both of the domain resin and matrix resin and a Izod impact value higher than the matrix resin to obtain a colored composition, followed by pulverizing and classifying the colored composition.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: June 7, 1994
    Assignees: Minolta Camera Kabushiki Kaisha, Mitsubishi Petrochemical Co., Ltd.
    Inventors: Sanji Inagaki, Shoichi Tsuge, Mineyuki Sako, Kenzo Toya, Yasuhiro Terunuma, Yukako Oya, Michio Ohmori