Patents by Inventor Hidenori Kin

Hidenori Kin 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).

  • Developing unit having developing roller with specific side surface roughness
    Patent number: 6094554
    Abstract: A developing unit of the present invention includes a case which accommodates toner containing pigment, a developing roller, a supply roller having chamfered ends and formed of an elastic member arranged to be pressed against a surface of the developing roller in such a manner as to supply toner to the surface of the developing roller. The side surfaces of the developing roller have a surface roughness of 0.5 .mu.m or smaller in Rmax.
    Type: Grant
    Filed: August 9, 1999
    Date of Patent: July 25, 2000
    Assignee: Seiko Epson Corporation
    Inventors: Kazuhiro Ichikawa, Yoshihiro Nakashima, Hidenori Kin, Tomoe Aruga, Yoichi Yamada, Yukio Takayama, Tahei Ishiwatari
  • Toner and a process for preparing thereof
    Patent number: 5192636
    Abstract: A toner material comprises toner particles containing at least a coloring matter and a binder, said toner particle having electrically insulating properties and comprising an inside portion having a relatively high relative permittivity and a surface portion having a relatively low relative permittivity.
    Type: Grant
    Filed: August 16, 1990
    Date of Patent: March 9, 1993
    Assignee: Seiko Epson Corporation
    Inventors: Masanao Kunugi, Hidenori Kin, Tsuneo Handa