Patents by Inventor Hirohito Kitabayashi

Hirohito Kitabayashi 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 preparing silica glass
    Patent number: 5236483
    Abstract: A method for preparing a silica glass article of improved purity is provided. The article is prepared by a sol-gel method and is then heat treated to a selected temperature between about 1500.degree. and 2200.degree. C. and maintained at the selected temperature for a predetermined period of time sufficient to remove silica crystals, inclusions, microcracks and bubbles. The resulting silica glass articles have improved purity and can be used as photomask substrates or as preforms for optical fibers.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: August 17, 1993
    Assignee: Seiko Epson Corporation
    Inventors: Satoru Miyashita, Sadao Kanbe, Motoyuki Toki, Tetsuhiko Takeuchi, Hirohito Kitabayashi