Patents by Inventor Yoshijuki Asahara

Yoshijuki Asahara 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).

  • Method for making a glass-based soft-edged aperture filters
    Patent number: 4065283
    Abstract: Glass-based soft-edged aperture filters having good thermal stability are produced by diffusing a coloring element such as Ag into a glass, thus providing a transmittance gradient in the colored portion thereof. A glass composition comprising a basic glass, such as a silicate, borosilicate or phosphate glass, and 1 to 10% by weight of As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3 is especially suitable for producing such soft-edged aperture filters.
    Type: Grant
    Filed: March 22, 1976
    Date of Patent: December 27, 1977
    Assignee: Hoya Glass Works, Ltd.
    Inventors: Yoshijuki Asahara, Tetsuro Izumitani