Patents by Inventor Katsuyuki Akiyoshi

Katsuyuki Akiyoshi 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).

  • Filter for partially transmitting light
    Patent number: 4070100
    Abstract: A filter comprises a plurality of quadrilateral filter units arranged one after another, each of which is made of two right-angled prisms whereby the incoming light is partially transmitted or shielded by the prisms.
    Type: Grant
    Filed: September 1, 1976
    Date of Patent: January 24, 1978
    Inventor: Katsuyuki Akiyoshi