Patents by Inventor Seki Yamaguchi

Seki Yamaguchi 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: 7160662
    Abstract: The present invention relates to an image forming method including: a charging step; an electrostatic latent image forming step; a developing step; a transfer step; a fixing step; and a cleaning step, wherein an electrostatic latent image developing agent comprises a toner and a carrier, wherein particles which have a volume resistivity of at least 1×1014 ?cm and an average primary particle diameter of 50 nm or less has a higher covering ratio than other particles on the toner particle surfaces, a shape factor SF1 of the toner is in the range of from 100 to 140, the carrier is a resin coated carrier, and at least a coating resin layer comprises a positively charging resin and a quaternary ammonium salt compound.
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: January 9, 2007
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Susumu Yoshino, Yoshifumi Iida, Seki Yamaguchi, Motoko Sakai, Sueko Sakai
  • Patent number: 7150906
    Abstract: A display panel includes a transparent image recording sheet having electrophotographically formed thereon at least a background portion, wherein space factor of pinholes per unit area of the background portion is no greater than 1×10?2%. A method of manufacturing the display panel is also disclosed. The background portion has a transparent optical density of 3.0 or greater and an image portion has a transparent optical density of 1.0 or less, and preferably 0.1 to 1. A toner used for electrophotographically forming the background portion and the image portion has a number average molecular weight of 1,000 to 6,000 and a weight average molecular weight of 30,000 to 150,000 as measured by gel permeation chromatography with respect to a portion of the toner dissolved in tetrahydrofuran, and has respective molecular weight distribution peaks in molecular weight ranges of 1000 to 10,000 and 100,000 to 1,500,000.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: December 19, 2006
    Assignees: Denso Corporation, Fuji Xerox Co., Ltd.
    Inventors: Teruhiko Iwase, Seki Yamaguchi, Yoshifumi Iida, Masanori Ichimura, Yoko Tomita, Yasuyuki Kobayashi
  • Patent number: 7095974
    Abstract: An image forming method including a charging step, a latent image forming step, a developing step, a transfer step, and a cleaning step, wherein remaining toner recovered in the cleaning step is used as recycled toner, and a ratio of the recycled toner to a total amount of supply toner supplied to a developer is 15% by weight or greater.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: August 22, 2006
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Susumu Yoshino, Motoko Sakai, Yoshifumi Iida, Sueko Sakai, Seki Yamaguchi
  • Patent number: 7018752
    Abstract: A display panel includes a transparent image recording sheet having electrophotographically formed thereon at least a background portion, wherein space factor of pinholes per unit area of the background portion is no greater than 1×10?2%. A method of manufacturing the display panel is also disclosed. The background portion has a transparent optical density of 3.0 or greater and an image portion has a transparent optical density of 1.0 or less, and preferably 0.1 to 1. A toner used for electrophotographically forming the background portion and the image portion has a number average molecular weight of 1,000 to 6,000 and a weight average molecular weight of 30,000 to 150,000 as measured by gel permeation chromatography with respect to a portion of the toner dissolved in tetrahydrofuran, and has respective molecular weight distribution peaks in molecular weight ranges of 1000 to 10,000 and 100,000 to 1,500,000.
    Type: Grant
    Filed: November 22, 2004
    Date of Patent: March 28, 2006
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Teruhiko Iwase, Seki Yamaguchi, Yoshifumi Iida, Masanori Ichimura, Yoko Tomita, Yasuyuki Kobayashi
  • Publication number: 20050074681
    Abstract: A display panel includes a transparent image recording sheet having electrophotographically formed thereon at least a background portion, wherein space factor of pinholes per unit area of the background portion is no greater than 1×10?2%. A method of manufacturing the display panel is also disclosed. The background portion has a transparent optical density of 3.0 or greater and an image portion has a transparent optical density of 1.0 or less, and preferably 0.1 to 1. A toner used for electrophotographically forming the background portion and the image portion has a number average molecular weight of 1,000 to 6,000 and a weight average molecular weight of 30,000 to 150,000 as measured by gel permeation chromatography with respect to a portion of the toner dissolved in tetrahydrofuran, and has respective molecular weight distribution peaks in molecular weight ranges of 1000 to 10,000 and 100,000 to 1,500,000.
    Type: Application
    Filed: November 22, 2004
    Publication date: April 7, 2005
    Applicant: Fuji Xerox Co., Ltd.
    Inventors: Teruhiko Iwase, Seki Yamaguchi, Yoshifumi Iida, Masanori Ichimura, Yoko Tomita, Yasuyuki Kobayashi
  • Publication number: 20040234310
    Abstract: An image forming method including a charging step, a latent image forming step, a developing step, a transfer step, and a cleaning step, wherein remaining toner recovered in the cleaning step is used as recycled toner, and a ratio of the recycled toner to a total amount of supply toner supplied to a developer is 15% by weight or greater.
    Type: Application
    Filed: December 12, 2003
    Publication date: November 25, 2004
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Susumu Yoshino, Motoko Sakai, Yoshifumi Iida, Sueko Sakai, Seki Yamaguchi
  • Publication number: 20040234877
    Abstract: The present invention relates to an image forming method including: a charging step; an electrostatic latent image forming step; a developing step; a transfer step; a fixing step; and a cleaning step, wherein an electrostatic latent image developing agent comprises a toner and a carrier, wherein particles which have a volume resistivity of at least 1×1014 &OHgr;cm and an average primary particle diameter of 50 nm or less has a higher covering ratio than other particles on the toner particle surfaces, a shape factor SF1 of the toner is in the range of from 100 to 140, the carrier is a resin coated carrier, and at least a coating resin layer comprises a positively charging resin and a quaternary ammonium salt compound.
    Type: Application
    Filed: December 11, 2003
    Publication date: November 25, 2004
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Susumu Yoshino, Yoshifumi Iida, Seki Yamaguchi, Motoko Sakai, Sueko Sakai
  • Publication number: 20030043108
    Abstract: A display panel includes a transparent image recording sheet having electrophotographically formed thereon at least a background portion, wherein space factor of pinholes per unit area of the background portion is no greater than 1×10−2%. A method of manufacturing the display panel is also disclosed. The background portion has a transparent optical density of 3.0 or greater and an image portion has a transparent optical density of 1.0 or less, and preferably 0.1 to 1. A toner used for electrophotographically forming the background portion and the image portion has a number average molecular weight of 1,000 to 6,000 and a weight average molecular weight of 30,000 to 150,000 as measured by gel permeation chromatography with respect to a portion of the toner dissolved in tetrahydrofuran, and has respective molecular weight distribution peaks in molecular weight ranges of 1000 to 10,000 and 100,000 to 1,500,000.
    Type: Application
    Filed: June 12, 2002
    Publication date: March 6, 2003
    Applicant: Denso Corporation
    Inventors: Teruhiko Iwase, Seki Yamaguchi, Yoshifumi Iida, Masanori Ichimura, Yoko Tomita, Yasuyuki Kobayashi