Patents by Inventor Michio Hirakawa

Michio Hirakawa 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).

  • Reinforcing composition for mineral structures
    Patent number: 4024098
    Abstract: A reinforcing composition for mineral structures which comprises as reactive ingredients one or more radical-polymerizable or copolymerizable monomer and a bisulfite ion-supplying substance. The use of the reinforcing composition facilitates reinforcement of natural or artificial mineral structures and products.
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: May 17, 1977
    Assignee: Mitsui Toatsu Kagaku Kabushiki Kaisha (Mitsui Toatsu Chemicals, Incorporated)
    Inventors: Tadashi Yamaguchi, Takayuki Ono, Hiroshi Hoshi, Michio Hirakawa, Isao Watanabe
  • Dry process for the production of plastic-coated inorganic substances
    Patent number: 3967006
    Abstract: Dry process for the production of inorganic granular substances coated with plastics, characterized in that a radical-polymerizable vinylic monomer carried on the surface of an inorganic granular substance is brought in a gaseous phase into contact with gaseous sulfur dioxide to effect polymerization of the monomer. The resulting plastic-coated inorganic substances are useful in various fields of industry, for example, as fillers, construction materials, molding materials, electrode materials, delayed-action fertilizers, etc.
    Type: Grant
    Filed: February 1, 1974
    Date of Patent: June 29, 1976
    Assignee: Lion Yushi Kabushiki Kaisha (Lion Fat & Oil Co., Ltd.)
    Inventors: Tadashi Yamaguchi, Takayuki Ono, Hiroshi Hoshi, Michio Hirakawa, Isao Watanabe
  • Method for coating inorganic compounds in powdered form
    Patent number: 3958044
    Abstract: A transition metal compound in powdered form or a mixture of a transition metal compound and other inorganic compounds in powdered form can be effectively coated with a polymer by contacting such powder with a vinyl monomer in the presence of hydrogen sulfite ions (HSO.sub.3 .sup.-).
    Type: Grant
    Filed: February 1, 1974
    Date of Patent: May 18, 1976
    Assignee: Lion Yushi Kabushiki Kaisha
    Inventors: Tadashi Yamaguchi, Takayuki Ono, Hirobumi Tanaka, Hiroshi Hoshi, Michio Hirakawa, Isao Watanabe
  • Method for coating particulate solids with polymers
    Patent number: 3953657
    Abstract: Particulate solids are coated with a polymer by bringing a particulate solid selected from glass particles, abrasive particles and sand particles into contact with a vinyl monomer in the presence of a polymerization intiator consisting essentially of bisulfite ions.
    Type: Grant
    Filed: January 28, 1974
    Date of Patent: April 27, 1976
    Assignee: Mitsui Toatsu Kagaku Kabushiki Kaisha
    Inventors: Tadashi Yamaguchi, Takayuki Ono, Hiroshi Hoshi, Michio Hirakawa, Isao Watanabe
  • Process for preparing plastic coated metal powders
    Patent number: 3935340
    Abstract: Metal powder is suspended in an aqueous medium containing a radical-polymerizable monomer and polymerization is conducted in the presence of an acidic sulfite ion to produce a plastic coated metal powder which is effectively used for forming conductive plastics, molded articles for sintering, pressed powder magnetic cores and the like.
    Type: Grant
    Filed: December 3, 1973
    Date of Patent: January 27, 1976
    Assignee: Lion Yushi Kabushiki Kaisha
    Inventors: Tadashi Yamaguchi, Takayuki Ono, Hiroshi Hoshi, Michio Hirakawa, Isao Watanabe
  • Method of manufacturing reinforced resin moldings
    Patent number: 3932350
    Abstract: A method of manufacturing reinforced resin moldings, wherein a fiber-reinforced plastic, obtained by the polymerization, in the presence of an inorganic fibrous substance selected from the group consisting of glass fiber, slag wool and asbestos, of a vinyl monomer, within an aqueous medium in the presence of sulfur dioxide, said fiber-reinforced plastic being composed of 5 - 50 wt.% of resin and 95 - 50 wt.% of inorganic substance and coated with a polymer, is subjected to compression molding.
    Type: Grant
    Filed: November 4, 1974
    Date of Patent: January 13, 1976
    Assignee: Lion Fat & Oil Co., Ltd.
    Inventors: Tadashi Yamaguchi, Takayuki Ono, Hiroshi Hoshi, Michio Hirakawa, Isao Watanabe