Patents by Inventor Yumiko Yagi

Yumiko Yagi 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).

  • Carrier for developing electrostatic latent image, and electrostatic latent image developer
    Patent number: 9146487
    Abstract: A carrier for developing electrostatic latent images includes a core material; and a covering layer formed of a resin comprising an electroconductive particulate material, overlying the core material, wherein the covering layer includes the electroconductive particulate material in an amount of from 58 to 73% by weight and has a resistivity of from 6.6 to 8.6 ?cm, and wherein the carrier has a high-brightness contrast part at an areal ratio less than 1% and 40 to 90% based on total area thereof at an acceleration voltage of 0.8 KV and 2.0 KV, respectively in an FE-SEM reflection electron image of the surface thereof.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: September 29, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Toyoshi Sawada, Shigenori Yaguchi, Hiroshi Tohmatsu, Hitoshi Iwatsuki, Toyoaki Tano, Hiroyuki Kishida, Yumiko Yagi
  • CARRIER FOR DEVELOPING ELECTROSTATIC LATENT IMAGE, AND ELECTROSTATIC LATENT IMAGE DEVELOPER
    Publication number: 20140023966
    Abstract: A carrier for developing electrostatic latent images includes a core material; and a covering layer formed of a resin comprising an electroconductive particulate material, overlying the core material, wherein the covering layer includes the electroconductive particulate material in an amount of from 58 to 73% by weight and has a resistivity of from 6.6 to 8.6 ?cm, and wherein the carrier has a high-brightness contrast part at an areal ratio less than 1% and 40 to 90% based on total area thereof at an acceleration voltage of 0.8 KV and 2.0 KV, respectively in an FE-SEM reflection electron image of the surface thereof.
    Type: Application
    Filed: July 1, 2013
    Publication date: January 23, 2014
    Inventors: Toyoshi SAWADA, Shigenori Yaguchi, Hiroshi Tohmatsu, Hitoshi Iwatsuki, Toyoaki Tano, Hiroyuki Kishida, Yumiko Yagi
  • Lubricant applying unit, process cartridge, image forming apparatus, and image forming method
    Patent number: 7505728
    Abstract: A lubricant applying unit includes a lubricant composed of metal salt of fatty acid; an applying member that applies the lubricant on a subject under lubricant application; and a spreading member that forms a thin layer of the lubricant applied on the subject. The spreading member spreads the lubricant in such a manner that a thickness of the thin layer is in a range of 8 nanometers to 12 nanometers.
    Type: Grant
    Filed: March 28, 2007
    Date of Patent: March 17, 2009
    Assignee: Ricoh Company, Limited
    Inventors: Daichi Yamaguchi, Kenji Sugiura, Takahiko Tokumasu, Takuya Seshita, Katsuhiko Tani, Yumiko Yagi
  • LUBRICANT APPLYING UNIT, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD
    Publication number: 20070166087
    Abstract: A lubricant applying unit includes a lubricant composed of metal salt of fatty acid; an applying member that applies the lubricant on a subject under lubricant application; and a spreading member that forms a thin layer of the lubricant applied on the subject. The spreading member spreads the lubricant in such a manner that a thickness of the thin layer is in a range of 8 nanometers to 12 nanometers.
    Type: Application
    Filed: March 28, 2007
    Publication date: July 19, 2007
    Inventors: Daichi YAMAGUCHI, Kenji Sugiura, Takahiko Tokumasu, Takuya Seshita, Katsuhiko Tani, Yumiko Yagi
  • Lubricant applying unit, process cartridge, image forming apparatus, and image forming method
    Patent number: 7209699
    Abstract: A lubricant applying unit includes a lubricant composed of metal salt of fatty acid; an applying member that applies the lubricant on a subject under lubricant application; and a spreading member that forms a thin layer of the lubricant applied on the subject. The spreading member spreads the lubricant in such a manner that a thickness of the thin layer is in a range of 8 nanometers to 12 nanometers.
    Type: Grant
    Filed: February 16, 2005
    Date of Patent: April 24, 2007
    Assignee: Ricoh Company, Limited
    Inventors: Daichi Yamaguchi, Kenji Sugiura, Takahiko Tokumasu, Takuya Seshita, Katsuhiko Tani, Yumiko Yagi
  • Lubricant applying unit, process cartridge, image forming apparatus, and image forming method
    Publication number: 20050191099
    Abstract: A lubricant applying unit includes a lubricant composed of metal salt of fatty acid; an applying member that applies the lubricant on a subject under lubricant application; and a spreading member that forms a thin layer of the lubricant applied on the subject. The spreading member spreads the lubricant in such a manner that a thickness of the thin layer is in a range of 8 nanometers to 12 nanometers.
    Type: Application
    Filed: February 16, 2005
    Publication date: September 1, 2005
    Inventors: Daichi Yamaguchi, Kenji Sugiura, Takahiko Tokumasu, Takuya Seshita, Katsuhiko Tani, Yumiko Yagi