Patents by Inventor Osamu Ebinuma

Osamu Ebinuma 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).

  • Method of producing colored precipitated calcium carbonate
    Patent number: 5120521
    Abstract: A colored precipitated calcium carbonate having a strong color fastness in water is produced by preparing an aqueous slurry containing calcium hydroxide and a water-soluble dye, for example, a direct dye, introducing a carbon dioxide-containing gas into the aqueous slurry, and collecting the resultant colored precipitated calcium carbonate from the aqueous slurry at a pH of 8.2 or more thereof.
    Type: Grant
    Filed: January 7, 1991
    Date of Patent: June 9, 1992
    Assignee: Oji Paper Co., Ltd.
    Inventors: Osamu Ebinuma, Takashi Sakaguchi, Akira Yokoi, Yoshiki Saitoh