Patents by Inventor Yuuko Komai

Yuuko Komai 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 photoconductor, process for forming an image, image forming apparatus and process cartridge for the same
    Patent number: 7175958
    Abstract: An electrophotographic photoconductor contains a conductive support; and a photoconductive layer disposed on the photoconductive support; wherein the photoconductive layer contains an azo compound expressed by a general formula <<1>> ArN?N—Cp)n,??(<<1>>) wherein in the general formula <<1>>, Ar is a substituted or non-substituted aromatic series hydrocarbon group or an aromatic series heterocyclic ring group which can be bonded by way of a bonding group; Cp is a coupler residual group; n represents an integer of 1, 2, 3, or 4, at least one of the Cp is a coupler residual group selected from the group consisting of general formulae <<2>>, <<3>>, and <<4>> wherein in the general formulae <<2>>, <<3>>, and <<4>>, all substituents are as defined in the specification.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: February 13, 2007
    Assignee: Ricoh Company, Ltd.
    Inventors: Masayuki Shoshi, Yuuko Komai, Hongguo Li, Masaomi Sasaki
  • Electrophotographic photoconductor, process for forming an image, image forming apparatus and process cartridge for the same
    Publication number: 20050112487
    Abstract: Providing an electrophotographic photoconductor comprising a conductive support and a photoconductive layer disposed on the photoconductive support; wherein the photoconductive layer contains an azo compound expressed by a general formula <<1>>. Ar?N?N—Cp)n ??general formula <<1>> (in the general formula <<1>>, Ar expresses one of a substituted or non-substituted aromatic carbon hydride group and heterocyclic ring aromatic series group which can be combined by way of a bond group; Cp expresses a coupler residual group; n expresses an integer of one of 1, 2, 3, and 4; at least one of the Cp is a coupler residual group selected from one of the following general formulae <<2>>, <<3>>, and <<4>>.
    Type: Application
    Filed: November 5, 2004
    Publication date: May 26, 2005
    Inventors: Masayuki Shoshi, Yuuko Komai, Hongguo Li, Masaomi Sasaki
  • Electrophotographic photoconductor, process for forming an image, image forming apparatus and a process cartridge for the same
    Patent number: 6849367
    Abstract: Providing an electrophotographic photoconductor comprising a conductive support and a photoconductive layer disposed on the photoconductive support; wherein the photoconductive layer contains an azo compound expressed by a general formula <<1>>. Ar?N?N—Cp)n??general formula <<1>> (in the general formula <<1>>, Ar expresses one of a substituted or non-substituted aromatic carbon hydride group and heterocyclic ring aromatic series group which can be combined by way of a bond group; Cp expresses a coupler residual group; n expresses an integer of one of 1, 2, 3, and 4; at least one of the Cp is a coupler residual group selected from one of the following general formulae <<2>>, <<3>>, and <<4>>.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: February 1, 2005
    Assignee: Ricoh Company, Ltd.
    Inventors: Masayuki Shoshi, Yuuko Komai, Hongguo Li, Masaomi Sasaki
  • Electrophotographic photoconductor, process for forming an image, image forming apparatus and a process cartridge for the same
    Publication number: 20030190540
    Abstract: Providing an electrophotographic photoconductor comprising a conductive support and a photoconductive layer disposed on the photoconductive support; wherein the photoconductive layer contains an azo compound expressed by a general formula <<1>>.
    Type: Application
    Filed: September 13, 2002
    Publication date: October 9, 2003
    Inventors: Masayuki Shoshi, Yuuko Komai, Hongguo Li, Masaomi Sasaki