Patents by Inventor Souichi Kubo

Souichi Kubo 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 filter suitable for portrait photography
    Patent number: 4480896
    Abstract: An improved soft focus optical filter is provided and comprises a plurality of effective filter areas on a transparent substrate. The filter areas are designed specifically to modify the modulation transfer function of the filter so that a selective soft focus effect is achieved only for transmitted green light.
    Type: Grant
    Filed: January 18, 1982
    Date of Patent: November 6, 1984
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Souichi Kubo, Yukio Okano