Patents by Inventor Yasuo Soyama

Yasuo Soyama 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 preparing cylindrical aluminum substrate for electrophotographic photoreceptor
    Patent number: 5237746
    Abstract: A method for preparing a drum comprising a cylindrical aluminum substrate coated with an electrophotographic photoreceptor having reduced streak defects which comprises forming the cylindrical aluminum substrate by the porthole method using a mold having ceramic surfaces.
    Type: Grant
    Filed: January 11, 1993
    Date of Patent: August 24, 1993
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Motohisa Aoki, Yasuo Soyama, Katsuji Sakata