Patents by Inventor Tadakatsi Shimada

Tadakatsi Shimada 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 for preparing a fused silica glass body co-doped with a rare earth element and aluminum
    Patent number: 5246475
    Abstract: A novel method is proposed for the preparation of a transparent fused silica glass body co-doped with a rare earth element and aluminum each in a high uniformity of the dopant distribution. The method comprises the steps of: (a) flame-hydrolyzing a silicon compound and an aluminum compound in an oxyhydrogen flame to form a porous silicon oxide body containing aluminum; (b) soaking the porous body having a specified bulk density with a solution of a rare earth compound; (c) drying the solution-soaked porous body; and (d) sintering and vitrifying the dried porous body into a transparent glass body.
    Type: Grant
    Filed: March 26, 1992
    Date of Patent: September 21, 1993
    Assignees: Shin-Etsu Chemical Co., Ltd., Kokusai Denshin Denwa Co., Ltd.
    Inventors: Noboru Edagawa, Yoshihiro Yoshida, Minoru Taya, Tadakatsi Shimada, Kazuo Koya