Patents by Inventor Seiitj Sakuma

Seiitj 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).

  • Patent number: 4521504
    Abstract: A composite photosensitive material for use in electrophotography which comprises a conductive substrate on which there is laminated a first photoconductive layer having a sensitivity to at least a part (Light A) of the chromatic light of visible light region and a second photoconductive layer capable of transmitting said Light A as well as having a sensitivity to another chromatic light (Light B), characterized in that said photoconductive layers are each capable of holding the electric charge of a polarity opposite to each other and additionally accepting as well as retaining a surface potential enough to develop an electrostatic latent image, which is formed by said electric charge, with a toner.
    Type: Grant
    Filed: June 17, 1981
    Date of Patent: June 4, 1985
    Assignee: Ricoh Company, Ltd.
    Inventors: Seiitj Sakuma, Shuichi Karasawa