Patents by Inventor Takehiko Hidaka

Takehiko Hidaka 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).

  • Optical waveguide for middle infrared band
    Patent number: 4453803
    Abstract: An optical waveguide for transmission of light in the middle infrared band is produced by having its clad part formed of glass consisting preponderantly of germanium dioxide and its core part left unfilled.
    Type: Grant
    Filed: April 26, 1982
    Date of Patent: June 12, 1984
    Assignees: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Takehiko Hidaka, Takitaro Morikawa, Junichi Shimada, Ken Kumata
  • Object discerning method and apparatus using a spatial wave propagation
    Patent number: 4023173
    Abstract: Disclosed is a method and apparatus for holographically discerning an object, using any kind of coherent wave such as microwave, millimeter wave, or sound wave. An asymmetric, dispersive medium is so positioned that some of the coherent wave scattered by the object may fall on the dispersive medium. The scattered wave passing through the medium falls on a stationary receiving antenna, and then the so received wave interferes with the reference wave to produce an interference pattern. The refraction of the scattered wave at the dispersive medium varies with the frequency of the wave and, therefore, the scattered wave impinging on the stationary antenna leaves from different positions on the dispersive medium if the frequency of the coherent wave used is varied.
    Type: Grant
    Filed: September 11, 1975
    Date of Patent: May 10, 1977
    Assignee: Agency of Industrial Science & Technology
    Inventor: Takehiko Hidaka