Patents by Inventor Yohko Kitahara

Yohko Kitahara 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: 7078142
    Abstract: An image forming method is disclosed. The method comprises processes in which a latent image on an electrophotographic photoreceptor is developed employing a developer material, and after transferring the visualized toner image to a recording material, the remaining toner on said photoreceptor is removed employing an elastic body cleaning blade. The electrophotographic photoreceptor comprises a surface layer containing a charge transportable polysiloxane hardenable resin, and said developer material comprises a fatty acid metal salt.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: July 18, 2006
    Assignee: Konica Corporation
    Inventors: Akihiko Itami, Tomoo Sakimura, Takeo Oshiba, Yohko Kitahara, Masahiko Kurachi, Kazuhisa Shida
  • Publication number: 20030049557
    Abstract: An image forming method is disclosed. The method comprises processes in which a latent image on an electrophotographic photoreceptor is developed employing a developer material, and after transferring the visualized toner image to a recording material, the remaining toner on said photoreceptor is removed employing an elastic body cleaning blade. The electrophotographic photoreceptor comprises a surface layer containing a charge transportable polysiloxane hardenable resin, and said developer material comprises a fatty acid metal salt.
    Type: Application
    Filed: May 21, 2002
    Publication date: March 13, 2003
    Inventors: Akihiko Itami, Tomoo Sakimura, Takeo Oshiba, Yohko Kitahara, Masahiko Kurachi, Kazuhisa Shida
  • Patent number: 6489069
    Abstract: An electrophotographic image carrier is disclosed. The image carrier has a photoreceptor made from a photoreceptive layer and a resin layer. The resin layer is made of a siloxane resin having a cross-linked structure, and contains an anti-oxidant.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: December 3, 2002
    Assignee: Konica Corporation
    Inventors: Akihiko Itami, Takeo Oshiba, Tomoo Sakimura, Yohko Kitahara, Masahiko Kurachi, Kazuhisa Shida
  • Patent number: 6442367
    Abstract: To provide an electrophotographic image forming method, an electro-photographic image forming apparatus, and a processing cartridge and an electrophotographic photoreceptor to be used therein, by which an electrophotographic image with a high image quality can be stably obtained in a condition of high temperature and high humidity. In an electrophotographic image forming method including cleaning a toner remained on a photoreceptor by a brush roller and an elastic rubber blade after transferring a toner image formed on the photoreceptor to an image receiving material, wherein the photoreceptor has a resin layer comprising a siloxane resin having an electric charge transportable structural unit and a cross-linked structure, the thickness of the single filament and the density of the filament of the brush roller are each from 3 denier to 30 denier and from 4.5×102 to 15.
    Type: Grant
    Filed: May 31, 2000
    Date of Patent: August 27, 2002
    Assignee: Konica Corporation
    Inventors: Akihiko Itami, Takeo Oshiba, Tomoo Sakimura, Yohko Kitahara, Masahiko Kurachi, Kazuhisa Shida
  • Publication number: 20020076238
    Abstract: An image forming method is disclosed. The method comprises processes in which a latent image on an electrophotographic photoreceptor is developed employing a developer material, and after transferring the visualized toner image to a recording material, the remaining toner on said photoreceptor is removed employing an elastic body cleaning blade. The electrophotographic photoreceptor comprises a surface layer containing a large transportable polysiloxane hardenable resin, and said developer material comprises a fatty acid metal salt.
    Type: Application
    Filed: April 18, 2000
    Publication date: June 20, 2002
    Inventors: Akihiko Itami, Tomoo Sakimura, Takeo Oshiba, Yohko Kitahara, Masahiko Kurachi, Kazuhisa Shida
  • Patent number: 6399262
    Abstract: An electrophotographic photoreceptor is disclosed. The photoreceptor has a photosensitive layer provided on an electrically conductive support which has a sealed alumite film, a surface layer of said electrophotographic photoreceptor comprises a hardenable siloxane resin having charge transportability or a hardenable siloxane resin comprising a partial structure having charge transportability.
    Type: Grant
    Filed: March 24, 2000
    Date of Patent: June 4, 2002
    Assignee: Konica Corporation
    Inventors: Takeo Oshiba, Akihiko Itami, Tomoo Sakimura, Yohko Kitahara, Masahiko Kurachi, Kazuhisa Shida
  • Patent number: 6265122
    Abstract: In an electrophotographic photoreceptor which comprises an electrically conductive support having thereon a multilayer composed of a photosensitive layer and a protective surface layer in said order, an electrophotographic photoreceptor characterized in that said protective surface layer comprised of a layer comprising structural units having charge transportability, as well as siloxane based resins having a cross linking structure, and said photosensitive layer comprises titanyl phthalocyanine having a maximum peak of Bragg angle (2&thgr;±0.2)° at 27.2° with respect to Cu-K&agr; ray.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: July 24, 2001
    Assignee: Konica Corporation
    Inventors: Akihiko Itami, Tomoo Sakimura, Takeo Oshiba, Yohko Kitahara, Masahiko Kurachi, Kazuhisa Shida
  • Patent number: 6203962
    Abstract: An electrophotographic image forming method in which, after transferring a toner image on an electrophotographic photoreceptor onto a recording material, the residual toner on said photoreceptor is removed employing an elastic body rubber blade is disclosed.
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: March 20, 2001
    Assignee: Konica Corporation
    Inventors: Akihiko Itami, Takeo Oshiba, Tomoo Sakimura, Yohko Kitahara, Masahiko Kurachi, Kazuhisa Shida
  • Patent number: 5853934
    Abstract: Disclosed is an electrophotographic photoreceptor comprising a substrate and provided thereon, a photosensitive layer comprising a charge generation material, a triarylamine charge transport material, and a compound represented by Formula 1: ##STR1## wherein R.sub.1 represents a secondary or tertiary alkyl group; R.sub.2 represents a halogen atom, an alkyl group, an aryl group or an alkoxyl group; n represents an integer of 0 to 3, and Ar represents an aryl group.
    Type: Grant
    Filed: July 18, 1997
    Date of Patent: December 29, 1998
    Assignee: Konica Corporation
    Inventors: Kazumasa Watanabe, Shingo Fujimoto, Naoto Abe, Hideo Yoshizawa, Tsuyoshi Shimoda, Yohko Kitahara
  • Patent number: 5846679
    Abstract: An electrophotographic photoreceptor containing an intermediate layer provide between a support and a photosensitive layer is disclosed. The intermediate layer contains at least one of an organic metal compound and a silane coupling agent or a product therefrom and its membranaceous index is 0.5 or more and 10 or less. The electrophotographic photoreceptor has low residual potential wherein no image defects such as spotting are caused over a long period of use.
    Type: Grant
    Filed: July 17, 1996
    Date of Patent: December 8, 1998
    Assignee: Konica Corporation
    Inventors: Yohko Kitahara, Eiichi Sakai, Kenichi Yasuda, Hiroaki Minemura, Fumitaka Mochizuki
  • Patent number: 5800956
    Abstract: A photoreceptor for electrophotography is disclosed. The photoreceptor has an electroconductive substrate, and an interlayer and a photoconductive layer provided on the substrate in this order from the substrate; the electroconductive substrate has a ten-point mean roughness R.sub.z of from 0.5 .mu.m to 4.0 .mu.m; and the interlayer comprises a reaction product of an organic metal compound with a formula (RO).sub.m MX.sub.n and a silane coupling agent.The average thickness L of the interlayer and the ten-point mean roughness of the surface of said substrate satisfy the following requirement:0.3 .mu.m+(0.1.times.R.sub.z .mu.m).ltoreq.L .mu.m.ltoreq.3.0 .mu.m+(0.5.times.R.sub.z .mu.m).
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: September 1, 1998
    Assignee: Konica Corporation
    Inventors: Hiroaki Minemura, Eiichi Sakai, Kenichi Yasuda, Yohko Kitahara
  • Patent number: 5716745
    Abstract: An electrophotographic photoreceptor is disclosed. The photoreceptor has an interlayer and a photosensitive layer provided on a conductive support, in which the interlayer comprising: an alkoxy metallic chelate compound of titanium or aluminum having a chelate group of acetoacetic ester or .beta.-diketone; and a silane coupling reagent having an organic functional group, the end of which is methacryloxy or amino group. A method of forming an electrophotographic image is also disclosed.
    Type: Grant
    Filed: October 3, 1996
    Date of Patent: February 10, 1998
    Assignee: Konica Corporation
    Inventors: Hiroaki Minemura, Kenichi Yasuda, Yohko Kitahara, Eiichi Sakai