Patents by Inventor Sonoo Matsuoka

Sonoo Matsuoka 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).

  • Process for producing binder resin for toners for developing electrostatic images
    Patent number: 6168896
    Abstract: A process for producing a binder resin for toners for developing electrostatic images, characterized by involving the step of stirring and thereby mixing a resin solution and an emulsified resin dispersion, and simultaneously or thereafter removing water and the solvent to give a solvent-free resin mixture composition.
    Type: Grant
    Filed: April 20, 1999
    Date of Patent: January 2, 2001
    Assignee: Nippon Carbide Kogyo Kabushiki Kaisha
    Inventors: Sonoo Matsuoka, Kaoru Kajino, Takashi Terabayashi, Hiroshi Serizawa
  • Process for producing binder resin for toner
    Patent number: 6074796
    Abstract: A process for producing a binder resin for a toner comprising the steps of (1) mixing a substantially solventless resin (A) and an emulsion of a resin (B) different from resin (A) with stirring and (2) evaporating water from the mixture of resin (A) and the emulsion of resin (B) simultaneously with or after the step (1) to obtain a substantially solventless resin composition.
    Type: Grant
    Filed: August 12, 1997
    Date of Patent: June 13, 2000
    Assignee: Nippon Carbide Kogyo Kabushiki Kaisha
    Inventors: Sonoo Matsuoka, Kaoru Kajino, Takashi Terabayashi, Hiroshi Serizawa
  • Toner binder, toner, electrophotographic method and apparatus therefor
    Patent number: 5618648
    Abstract: A toner binder is disclosed which comprises a polyester resin in which an aliphatic hydrocarbon chain terminated with an ester and/or an ether bond to the aliphatic group contains a constituent element consisting of ethylene in an amount of from 1 to 5 wt % based on the total weight of the resin. Further disclosed is a toner binder using both of a crosslinked polyester having a peak molecular weight of 10,000 or less and a linear polyester having a peak molecular weight of 8,000 or more as binder resins, the peak molecular weight of the linear polyester being greater than the peak molecular weight of the crosslinked polyester.
    Type: Grant
    Filed: July 12, 1995
    Date of Patent: April 8, 1997
    Assignees: Fujitsu Limited, Nippon Carbide Industries, Co., Inc.
    Inventors: Yuzo Horikoshi, Norio Sawatari, Takeshi Ogino, Hiroaki Naito, Makoto Koshi, Kazuhiko Kido, Takashi Yamamoto, Eiji Sakurai, Yoshimichi Katagiri, Masatoshi Maruyama, Hidenori Nitta, Sonoo Matsuoka