Patents by Inventor Sigeru Iizima

Sigeru Iizima 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).

  • Patent number: 4208637
    Abstract: A tunable optical device is produced by forming in the surface of a substrate a fan-shaped grating of continuously varying period by means of a holographic technique using a photoresist and twisted mirrors, coating the surface of the substrate containing the formed grating with a polyurethane film and diffusing a dye in the prescribed region of the resultant polyurethane film coated on the substrate. In the device of the construction described above, irradiation of the region having the fan-shaped grating with a laser light generates laser light beams whose wavelength is variable with the position at which the laser light impinges upon the region of the grating.
    Type: Grant
    Filed: March 3, 1978
    Date of Patent: June 17, 1980
    Assignee: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Akihisa Matsuda, Sigeru Iizima