Patents by Inventor Iwao Motoyama

Iwao Motoyama 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 of producing plate-shaped calcium carbonate particles
    Patent number: 4857291
    Abstract: Disclosed is a novel process of producing plate-shaped calcium carbonate particles. The process comprises the steps of adding aqueous calcium hydrogen carbonate solution with a temperature of less than 50.degree. C. into an aqueous medium bath held at a temperature of not less than 50.degree. C. to generate plate-shaped calcium carbonate particles in the bath, the temperature of the bath being kept not less than 50.degree. C. during the addition of the aqueous calcium hydrogen carbonate solution; and recovering the generated plate-shape calcium carbonate particles.
    Type: Grant
    Filed: March 10, 1988
    Date of Patent: August 15, 1989
    Assignee: Yabashi Industries Co., Ltd.
    Inventors: Yoshio Ota, Norifumi Goto, Iwao Motoyama, Tetsushi Iwashita, Kunio Nomura
  • Process of producing needle-shaped calcium carbonate particles
    Patent number: 4824654
    Abstract: Disclosed is a novel process of producing needle-shaped calcium carbonate particles. In the process of the present invention, aqueous calcium hydroxide solution is added to an aqueous medium bath with a temperature of not less than 60.degree. C. into which carbon dioxide gas or a carbon dioxide-containing gas is being blown to generate needle-shaped calcium carbonate particles. The temperature of the aqueous medium bath is kept not less than 60.degree. C. during the addition of the aqueous calcium hydroxide solution. Then the generated needle-shaped calcium carbonate particles are recovered.
    Type: Grant
    Filed: March 17, 1988
    Date of Patent: April 25, 1989
    Assignee: Yabashi Industries Co., Ltd.
    Inventors: Yoshio Ota, Norifumi Goto, Iwao Motoyama, Tetsushi Iwashita, Kunio Nomura