Patents by Inventor Yoshiyuki Mizumo

Yoshiyuki Mizumo 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).

  • Patent number: 4925525
    Abstract: A method of making a printed circuit board includes providing a substrate coated with a conductive layer, developing a first photoresist layer on the conductive layer to define a first conductive pattern of the desired circuit configuration having a plurality of discontinuous segments, and a second conductive pattern interconnecting the discontinuous segments of the desired circuit configuration. A second layer of photoresist is positioned across the whole surface of the substrate except at least a selected portion of the first conductive pattern, and the substrate is electrically activated during a coating process for depositing conductive material on the selected portion of the first conductive pattern. The first conductive pattern is subsequently coated with photoresist, and the second conductive pattern, which is now exposed on the substrate, is subject to an etching process to effectively remove all of the second conductive pattern.
    Type: Grant
    Filed: April 10, 1989
    Date of Patent: May 15, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Shunji Oku, Yoshiyuki Mizumo, Kiyoshi Seigenji