Patents by Inventor Ken Kumata

Ken Kumata 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
  • Reversibly photosensitive glass
    Patent number: 4194916
    Abstract: A reversibly photosensitive glass consisting of cadmium oxide, germanium dioxide, sodium oxide and thallous oxide. A reversibly photosensitive glass consisting of silicon dioxide, sodium oxide, cadmium oxide and thallous oxide.
    Type: Grant
    Filed: March 9, 1979
    Date of Patent: March 25, 1980
    Assignee: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Ken Kumata, Hiroshi Namikawa