Patents by Inventor Yoshiyasu Matsumoto

Yoshiyasu Matsumoto 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).

  • Publication number: 20050089779
    Abstract: An image forming method for forming a full color toner image by overlaying four color electrostatic image developing toners of black, yellow, magenta and cyan, wherein at least one of the four color electrostatic image developing toners is a toner containing a large diameter external additive in a larger amount and at least one is a toner containing the large diameter external additive in a smaller amount, in which the primary particle diameter of the large diameter external additive is from 150 nm to 2,000 nm, the content of the large diameter external additive in the toner containing the large diameter external additive in larger amount is from 0.06% by weight to 4.0% by weight and the content of the large diameter external additive in the toner containing the large diameter external additive in the smaller amount is not more than 0.05% by weight.
    Type: Application
    Filed: August 24, 2004
    Publication date: April 28, 2005
    Inventors: Yoshiyasu Matsumoto, Meizo Shirose, Naohiro Hirose, Tatsuya Nagase, Asao Matsushima, Shiro Hirano
  • Publication number: 20050089778
    Abstract: Disclosed is a method for forming color image, in which one of the yellow, magenta, cyan and black toners is a high water content toner, and one of the yellow, magenta, cyan and black toners is a toner low water content toner, water content of the high water content toner is 1.2 to 2.5 % by weight based on the high water content toner, and water content of the low water content toner is 0.1 to 1.2% by weight based on the low water content toner.
    Type: Application
    Filed: December 20, 2004
    Publication date: April 28, 2005
    Inventors: Tatsuya Nagase, Meizo Shirose, Naohiro Hirose, Asao Matsushima, Yoshiyasu Matsumoto, Shiro Hirano
  • Publication number: 20030219667
    Abstract: The invention relates to a static latent image developing toner comprising toner particles, each of the toner particles comprising a toner intermediate particle having inorganic oxide particles on the surface, wherein a surface existence density of the inorganic oxide particle having a feret's diameter of 110 nm to 160 nm on the toner intermediate particle is 5 to 50 per &mgr;m2, and relates to a developer comprising the toner and an image forming method utilizing the toner.
    Type: Application
    Filed: May 20, 2003
    Publication date: November 27, 2003
    Inventors: Yoshiyasu Matsumoto, Ken Ohmura, Tatsuya Nagase, Kaori Soeda