Patents by Inventor Souichi Fujii

Souichi Fujii 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).

  • Ceramic abrasive grains, method of producing the same and abrasive products made of the same
    Patent number: 5431704
    Abstract: Al.sub.2 O.sub.3 -Er.sub.2 O.sub.3 ceramic abrasive grains comprising a second phase consisting of aluminum oxides and erbium oxides in the form of reaction products surrounding a first phase and the first phase exclusive of the second phase and substantially consisting of alpha alumina only, the size of the crystal grain consisting of two phases being below 1 micron, which are obtained by a sol-gel process wherein erbium precursor is incorporated before sintering in an amount of 0.05-0.4 wt % in a form of Er.sub.2 O.sub.3, which is suitable for lapping composition, grinding wheel, grinding disc and coated abrasive articles.
    Type: Grant
    Filed: October 25, 1993
    Date of Patent: July 11, 1995
    Assignee: Japan Abrasive Co., Ltd.
    Inventors: Masahiro Tamamaki, Souichi Fujii, Naruo Suzuki