Patents by Inventor Teruo Sakuma

Teruo Sakuma 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).

  • Making process of a die for stamping out patterns
    Patent number: 4579022
    Abstract: The invention provides a novel method for manufacturing a knife-edge die for stamping out a metal foil on an insulating base plate such as in the preparation of an electronic circuit board by a technique of photoetching. The method comprises a line pattern of a photoresist film on the die face corresponding to the contour of the desired pattern, subjecting the die face to a first etching to effect substantial side etching behind the photoresist film to leave an edge, removing the photoresist film and subjecting the die face to a second etching to sharpen the edge into a knife edge.
    Type: Grant
    Filed: October 7, 1983
    Date of Patent: April 1, 1986
    Assignee: Fujikura Cable Works, Ltd.
    Inventors: Yasuo Kasai, Koichi Yamada, Teruo Sakuma, Masahiro Koguchi