Patents by Inventor Hongguo Li

Hongguo Li 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).

  • Publication number: 20050266328
    Abstract: An electrophotographic photoreceptor including an electroconductive substrate and a photosensitive layer overlying the electroconductive substrate. An outermost layer of the electrophotographic photoreceptor is a crosslinked layer including a radical polymerizing monomer having three or more functional groups without a charge transporting structure. The outermost layer also includes a radical polymerizing compound having one functional group with a charge transporting structure and a reactive silicone compound having a radical polymerizing functional group.
    Type: Application
    Filed: September 20, 2004
    Publication date: December 1, 2005
    Inventors: Yoshiki Yanagawa, Hiroshi Ikuno, Hongguo Li, Kazukiyo Nagai, Hiroshi Tamura, Tetsuro Suzuki
  • Publication number: 20050221210
    Abstract: An electrophotographic photoconductor having at least a photoconductive layer on an electrically conductive support, wherein a surface layer of the photoconductive layer is a crosslinked layer obtainable by curing at least a three or more-functional radical-polymerizable monomer having no charge transporting structure and a charge transportation compound having a radical-polymerizable functional group by using an acylphosphine oxide compound as a photo-polymerization initiator under light energy irradiation.
    Type: Application
    Filed: March 18, 2005
    Publication date: October 6, 2005
    Inventors: Tetsuro Suzuki, Hiroshi Tamura, Hiroshi Ikuno, Yoshiki Yanagawa, Kazukiyo Nagai, Hongguo Li
  • Patent number: 6939651
    Abstract: An electrophotographic photoconductor comprising at least an electroconductive support and a photoconductive layer which is formed on said electroconductive support, the outermost layer of the photoconductor contains particles comprising a polyorganosiloxane-containing phase which contains polyorganosiloxane and an organic polymer-containing phase which contains organic polymer without silicon and has a polyorganosiloxane content which is less than the polyorganosiloxane-containing phase, each phase being exposed at the top surface of the photoconductor.
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: September 6, 2005
    Assignee: Ricoh Company, Ltd.
    Inventors: Hongguo Li, Kazukiyo Nagai, Masaomi Sasaki, Shinichi Kawamura, Yasuo Suzuki, Nozomu Tamoto, Kawori Tanaka
  • Publication number: 20050158641
    Abstract: An electrophotographic photoconductor having at least a photoconductive layer on an electrically conductive support, in which a surface layer of the photoconductive layer can be obtained by curing at least a free-radical-polymerizable monomer having no electron transporting structure, represented by general formula (A) and a one-functional free-radical-polymerizable compound having an electron transporting structure, wherein R71, R72, R73, R74, R75, and R76 are described in the specification.
    Type: Application
    Filed: January 13, 2005
    Publication date: July 21, 2005
    Inventors: Yoshiki Yanagawa, Hiroshi Ikuno, Hongguo Li, Kazukiyo Nagai, Hiroshi Tamura, Tetsuro Suzuki, Naohiro Toda, Yoshiaki Kawasaki
  • Patent number: 6899983
    Abstract: The present invention aims to provide a photoconductor having improved wear resistance, and which has reduced foreign matter attached on the photoconductor surface. The electrophotographic photoconductor of the present invention is formed by sequentially disposing a photoconductive layer comprising at least one layer and a protective layer on an electroconductive support, and the protective layer comprises an acrylic resin and/or a methacrylic resin and a resin composition comprising an acryl-modified polyorganosiloxane compound which is dispersed in or compatible with the acrylic resin and/or the methacrylic resin.
    Type: Grant
    Filed: April 3, 2003
    Date of Patent: May 31, 2005
    Assignee: Ricoh Company, Ltd.
    Inventors: Nozomu Tamoto, Yasuo Suzuki, Kazukiyo Nagai, Hongguo Li
  • 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
  • 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
  • Publication number: 20040253527
    Abstract: Disclosed is an electrophotographic photoconductor including at least a photoconductive layer on a conductive substrate, wherein the surface layer of the photoconductive layer contains at least a surface crosslinked layer formed by curing a tri- or more-functional radical polymerizable monomer without having a charge transporting structure and a mono-functional radical polymerizable compound having a charge transporting structure and the surface crosslinked layer has a surface roughness Rz of 1.3 &mgr;m or less.
    Type: Application
    Filed: March 19, 2004
    Publication date: December 16, 2004
    Inventors: Tetsuro Suzuki, Hiroshi Tamura, Hiroshi Ikuno, Kazukiyo Nagai, Hongguo Li
  • Publication number: 20040248024
    Abstract: Disclosed is an electrophotographic photoconductor including at least a photoconductive layer on an electroconductive substrate, which comprises at least a cross-linked surface layer formed by curing a tri- or more-functional radical polymerizable monomer without having a charge transporting structure and a mono-functional radical polymerizable compound having a charge transporting structure wherein the cross-linked surface layer has a surface roughness Rz of 1.3 &mgr;m or less.
    Type: Application
    Filed: March 19, 2004
    Publication date: December 9, 2004
    Inventors: Tetsuro Suzuki, Hiroshi Tamura, Hiroshi Ikuno, Kazukiyo Nagai, Hongguo Li
  • Publication number: 20040053152
    Abstract: An electrophotographic photoconductor having a layer of a crosslinked resin obtained by reacting an epoxy group-containing amine compound having a charge transferability-imparting group with at least one silicon compound selected from an epoxy ring-free alkoxysilane compound, an epoxy ring-free silanol compound, an epoxy ring-containing alkoxysilane compound and an epoxy ring-containing silanol compound.
    Type: Application
    Filed: June 11, 2003
    Publication date: March 18, 2004
    Inventors: Kazukiyo Nagai, Chiaki Tanaka, Tetsuro Suzuki, Hiroshi Ikuno, Hongguo Li
  • Publication number: 20040048177
    Abstract: The present invention aims to provide a photoconductor having improved wear resistance, and which has reduced foreign matter attached on the photoconductor surface.
    Type: Application
    Filed: April 3, 2003
    Publication date: March 11, 2004
    Inventors: Nozomu Tamoto, Yasuo Suzuki, Kazukiyo Nagai, Hongguo Li
  • 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
  • Publication number: 20030059695
    Abstract: An electrophotographic photoconductor comprising at least an electroconductive support and a photoconductive layer which is formed on said electroconductive support, the outermost layer of the photoconductor contains particles comprising a polyorganosiloxane-containing phase which contains polyorganosiloxane and an organic polymer-containing phase which contains organic polymer without silicon and has a polyorganosiloxane content which is less than the polyorganosiloxane-containing phase, each phase being exposed at the top surface of the photoconductor.
    Type: Application
    Filed: June 21, 2002
    Publication date: March 27, 2003
    Inventors: Hongguo Li, Kazukiyo Nagai, Masaomi Sasaki, Shinichi Kawamura, Yasuo Suzuki, Nozomu Tamoto, Kawori Tanaka