Patents by Inventor Konosuki Oishi

Konosuki Oishi 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).

  • Diffraction grating having a plurality of different grating constants
    Patent number: 4886341
    Abstract: In a diffraction grating grooves having at least two kinds of grating constants are alternately arranged so as to repetitive at a constant period.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: December 12, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Konosuki Oishi, Kenshi Sugahara