Patents by Inventor Katsuyu Takahashi

Katsuyu Takahashi 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).

  • Light exposure apparatus with cooling means
    Patent number: 4535234
    Abstract: Light exposure apparatus comprises a light source, a spectral filter perivious to light of a prescribed wavelength range, a glass member whose cut-off frequency in the prescribed wavelength range is variable with temperature, and a temperature control for controlling the temperature of the glass member. Intensity of the light from the light source, passing through the spectral filter and glass member, and impinging upon the surface subject to light-exposure is controlled by the temperature control.
    Type: Grant
    Filed: September 29, 1981
    Date of Patent: August 13, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Fujimura, Katsuyu Takahashi, Masahiro Nishizawa
  • Method of manufacturing curved discharge tubes
    Patent number: 4433994
    Abstract: A curved discharge tube is manufactured by preparing a straight quartz tube having an eccentric longitudinal opening and then bending the heated tube into a current tube with a thicker waall portion of the tube on the outside and the thinner wall portion on the inner side. It is advantageous to seal inner gas into the tube before bending so as to obtain a curved tube having uniform wall thickness.
    Type: Grant
    Filed: June 17, 1981
    Date of Patent: February 28, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Fujimura, Katsuyu Takahashi