Patents by Inventor Yoshiaki Torimoto

Yoshiaki Torimoto 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).

  • Spherical electrophotographic toner particles comprising carbon and preparation thereof
    Patent number: 4956259
    Abstract: A toner composition having particles substantially in the spherical form and comprises a binder resin and carbon black having a number-average particle size of 20 to 500 millimicrons and a standard deviation of particle size distribution of 70 millimicrons or smaller.
    Type: Grant
    Filed: July 14, 1987
    Date of Patent: September 11, 1990
    Assignee: Kao Corporation
    Inventors: Yoshitsugu Shirasaki, Yoshiaki Torimoto
  • Spherical toner particle
    Patent number: 4895785
    Abstract: A toner particle composition substantially spherical in form and comprising binder resin and carbon black dispersed thereon, the surface area of the particle being covered with the carbon black in an amount not greater than 25 percent of the entire surface area of the toner particle.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: January 23, 1990
    Assignee: Kao Corporation
    Inventors: Yoshiaki Torimoto, Yoshitsugu Shirasaki