Patents by Inventor Umeda Masahiro

Umeda Masahiro 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 of improving image sharpness of an electrophotographic photosensitive plate
    Patent number: 4421837
    Abstract: A method of improving image sharpness or image resolution on a dye sensitized electrophotographic photosensitive plate to be negatively charged before image light exposure and with use of positively charged toners, the method comprising applying ultraviolet light to the surface of the dye-sensitized photoconductive layer of the plate before the negative charging. Thereby, it becomes possible to use positively charged toners with excellent resultant image sharpness or resolution.
    Type: Grant
    Filed: March 5, 1979
    Date of Patent: December 20, 1983
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasuba Hiroshi, Umeda Masahiro, Yuri Osamu