Patents by Inventor Te Nam Roh

Te Nam Roh 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).

  • Electrophotographic photoreceptor having conductive layer and amorphous carbon overlayer
    Patent number: 5262262
    Abstract: An electrophotographic photoreceptor having excellent dark resistance is disclosed, which comprises a photoconductive layer and a surface layer formed successively on a conductive substrate, wherein the photoconductive layer mainly comprises hydrogen-containing amorphous silicon, and the surface layer comprises amorphous carbon which contains not more than 50 atomic percent of hydrogen.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: November 16, 1993
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Shigeru Yagi, Masayuki Nishikawa, Te Nam Roh, Ken-ichi Karakida, Masahito Tokuhiro, Yuzuru Fukuda, Noriyoshi Takahashi
  • Electrophotographic photoreceptor having surface layers
    Patent number: 4965154
    Abstract: An electrophotographic photoreceptor comprising a photoconductive layer, a first surface layer and a second surface layer formed in sequence on a support, said photoconductive layer being substantially composed of amorphous silicon, and each of said first and second surface layers being substantially composed of nitrogen-doped amorphous silicon, the concentration of nitrogen atoms in the second surface layer being higher than that in the first surface layer. The photoconductive layer is doped with atoms of an element of group III, or in at least a part of the photoconductive layer doped with germanium atoms in place of the element of group III.
    Type: Grant
    Filed: June 19, 1989
    Date of Patent: October 23, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kenichi Karakida, Shigeru Yagi, Yuzuru Fukuda, Masayuki Nishikawa, Te Nam Roh, Noriyoshi Takahashi, Masato Ono
  • Electrophotographic photoreceptor having doped and/or bilayer amorphous silicon photosensitive layer
    Patent number: 4932859
    Abstract: An electrophotographic photoreceptor having excellent dark resistance is disclosed, which comprises a photoconductive layer and a surface layer formed successively on a conductive substrate, wherein the photoconductive layer mainly comprises hydrogen-containing amorphous silicon, and the surface layer comprises amorphous carbon which contains not more than 50 atomic percent of hydrogen. The surface layer contains phosphorous or boron as a dopant and/or comprises two sublayers where the sublayer has a lower hydrogen content than the lower sublayer.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: June 12, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Shigeru Yagi, Masayuki Nishikawa, Te Nam Roh, Ken-ichi Karakida, Masahito Tokuhiro, Noriyoshi Takahashi, Yuzuru Fukuda