Patents by Inventor Keigo Mutamura

Keigo Mutamura 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).

  • TWO-COMPONENT COLOR DEVELOPER AND IMAGE FORMATION DEVICE USING SAME
    Publication number: 20140242510
    Abstract: A two-component color developer containing a toner and a resin-coated carrier, the toner containing at least a polyester resin as a binding resin, an organic pigment as a colorant and inorganic fine particles as an external additive, wherein the inorganic fine particles have a negative polarity, the toner has a volume resistivity of 40×109 to 220×109 ?cm and a negative polarity, and the carrier has a coat durability of 90% or greater.
    Type: Application
    Filed: July 25, 2012
    Publication date: August 28, 2014
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Tadayuki Sawai, Yoritaka Tsubaki, Keiichi Kikawa, Keigo Mutamura, Yui Kawano, Shintaro Fukuoka