Patents by Inventor Ru-guang Cheng

Ru-guang Cheng 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).

  • Amorphous silicon electrophotographic photoreceptor with an intermediate gradient layer and its method of preparation
    Patent number: 4913995
    Abstract: An amorphous silicon function separation type electrophotographic photoreceptor is disclosed having thin layers, wherein an intermediate layer provides the photoreceptor with high surface potential and low residual potential for positive and negative charging. The intermediate layer lies between a large band gap a-Si alloy transport layer and an a-Si:H photosensitive layer.
    Type: Grant
    Filed: December 13, 1988
    Date of Patent: April 3, 1990
    Assignee: Guo Jing Kun, Shanghai Institute of Ceramics
    Inventors: Dong-zhi Chi, Ru-guang Cheng