Patents by Inventor Masafumi Kamiyama

Masafumi Kamiyama 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).

  • Apparatus for suspension polymerization
    Patent number: 6264357
    Abstract: A method of suspension polymerization of a monomeric composition to produce a polymer or a polymer composition is disclosed which method comprises the steps of retaining a disperse phase component composed of the monomeric composition and a continuous phase component composed of a medium in independent vessels, supplying the disperse phase component and the continuous phase component from their respective vessels into a disperser simultaneously and continuously through associated independent passageways, applying shear force in the disperser to form a dispersion having droplets of a desired size, subsequently introducing the dispersion into a polymerization vessel, and completing a polymerizating reaction to produce a polymer or a polymer composition.
    Type: Grant
    Filed: December 27, 1993
    Date of Patent: July 24, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Masafumi Kamiyama, Haruhiko Yano, Minoru Tsuchida, Eiji O'Shima
  • Method and apparatus of suspension polymerization
    Patent number: 6140394
    Abstract: A method of suspension polymerization of a monomeric composition to produce a polymer or a polymer composition is disclosed which method comprises the steps of retaining a disperse phase component composed of the monomeric composition and a continuous phase component composed of a medium in independent vessels, supplying the disperse phase component and the continuous phase component from their respective vessels into a disperser simultaneously and continuously through associated independent passageways, applying shear force in the disperser to form a dispersion having droplets of a desired size, subsequently introducing the dispersion into a polymerization vessel, and completing a polymerizating reaction to produce a polymer or a polymer composition.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: October 31, 2000
    Assignee: Tomoegawa Paper Co.
    Inventors: Masafumi Kamiyama, Haruhiko Yano, Minoru Tsuchida, Eiji O'shima
  • Suspension polymerization method and particles obtained therewith
    Patent number: 5717041
    Abstract: The present invention provides a suspension polymerization method for producing a polymerized particle having cavities in the particle.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: February 10, 1998
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Masafumi Kamiyama, Masahiro Maeda, Hiroki Totsuka, Akihiro Sano
  • Suspension polymerization method
    Patent number: 5608017
    Abstract: The present invention provides a suspension polymerization method for producing a polymerized particle having cavities in the particle.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: March 4, 1997
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Masafumi Kamiyama, Masahiro Maeda, Hiroki Totsuka, Akihiro Sano
  • Suspension polymerization method and toner for electrophotography obtained therewith
    Patent number: 5346798
    Abstract: The present invention provides a suspension polymerization method which provides polymerized particles exhibiting excellent charging properties and a toner composed of the polymerized particles obtained with the method.
    Type: Grant
    Filed: March 12, 1993
    Date of Patent: September 13, 1994
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Masafumi Kamiyama, Masahiro Maeda, Hiroki Totsuka, Akihiro Sano, Toshiya Matsushita