Patents by Inventor Eio Hisajima

Eio Hisajima 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).

  • Resinous microparticles useful in powdery toner for electrophotography
    Patent number: 4968576
    Abstract: Resinous microparticles useful in toner for electrophotography which are made of vinyl resin obtained by emulsion polymerization of at least one .alpha.,.beta.-ethylenically unsaturated monomers in the presence of cationic surfactant having an onium salt structure and a polymerization initiator having an amidine or amidine salt structure and whose average particle diameter is in a range of from 0.01 to 1.mu., and toner composition comprising toner particles and resinous microparticles as abovementioned are provided.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: November 6, 1990
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Masayuki Maruta, Katsuaki Kida, Eio Hisajima, Akio Kashihara, Naoya Yabuuchi
  • Magnetic carrier particles for electrophotographic developer having plated layer of iron oxide
    Patent number: 4816364
    Abstract: The present invention is intended to provide a carrier to be used as a two-component developer, wherein a nuclide particle surface has a magnetic plated layer composed of an iron oxide. The carrier according to the present invention is to be used in the electrophotographic method, electrostatic recording method, and electrostatic printing method, and also provides an excellent developer which is lightweight and has a long service life.
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: March 28, 1989
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Masao Oishi, Takao Saito, Kouichi Nagata, Katsukiyo Ishikawa, Eio Hisajima