Patents by Inventor Yoshiki Fukatsu

Yoshiki Fukatsu 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).

  • Fine acicular .alpha.-ferric oxide and production thereof
    Patent number: 5569445
    Abstract: Disclosed herein is fine acicular .alpha.-ferric oxide which has the crystallite diameter (D.sub.1014) in the direction perpendicular to the (1014) plane and the crystallite diameter (D.sub.1120) in the direction perpendicular to the (1120) plane such that their ratio D.sub.1014 /D.sub.1120 is in the range of 1-2, and also has a specific surface area of 40-50 m.sup.2 g. Disclosed also herein is fine acicular .alpha.-ferric oxide which has the crystallite diameter (D.sub.1014) in the direction perpendicular to the (1014) plane and the crystallite diameter (D.sub.1120) in the direction perpendicular to the (1120) plane such that their ratio D.sub.1014 /D.sub.1120 is the range of 1-2, and also has an average aspect ratio of 10-15 and a specific surface area of 20-40 m.sup.2 /g. They are produced by wet process including the step of hydrothermal reaction.
    Type: Grant
    Filed: December 29, 1994
    Date of Patent: October 29, 1996
    Assignee: Sakai Chemical Industry Co., Ltd.
    Inventors: Yoshiki Fukatsu, Shinji Nakahara, Youichi Yamada, Hideji Yamamoto, Tatsuya Hida, Mizuho Wada