Patents by Inventor Nobu Kuzuu

Nobu Kuzuu 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).

  • Ultraviolet ray-transparent optical glass material and method of producing same
    Patent number: 6376401
    Abstract: A synthetic silica glass having a high transmittance for vacuum ultraviolet rays, for example F2 excimer laser beam with a wavelength of 157 nm, a high uniformity and a high durability and useful for ultraviolet ray-transparent optical glass materials is produced from a high-purity silicon compound, for example silicon tetrachloride, by heat treating an accumulated porous silica material at a temperature not high enough to convert the porous silica material to a transparent silica glass in an inert gas atmosphere for a time sufficient to cause the OH groups to be condensed and removed from the glass, and exhibits substantially no content of impurities other than OH group a difference between highest and lowest fictional temperatures of 50° C.
    Type: Grant
    Filed: September 1, 1999
    Date of Patent: April 23, 2002
    Assignees: Tosoh Corporation, Nippon Silica Glass Co., Ltd., Yamaguchi Nippon Silica Glass Co., Ltd.
    Inventors: Shinichi Kondo, Takayuki Nakamura, Kazuhiko Fukuda, Naoyoshi Kamisugi, Nobu Kuzuu, Yoshinao Ihara, Hidetoshi Wakamatsu