Patents by Inventor Toshiyuki Oba

Toshiyuki Oba 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).

  • Electrophotographic developer having different polyolefin waxes
    Patent number: 5292609
    Abstract: The developing agent comprises a colorant and vinyl-based polymer synthetic resin to which polyolefin waxes having softening points different from each other are added. Due to this softening point difference, the solidification time period for the waxes after fixation is prolonged; therefore the developing agent attains good fixation and anti-offset properties without deteriorating the preservation property and the fluidity of the developing agent.
    Type: Grant
    Filed: March 24, 1992
    Date of Patent: March 8, 1994
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuzaburo Yoshikawa, Toshiaki Yamauchi, Toshiyuki Oba, Akira Takano