Patents by Inventor Tomotake Hiraga

Tomotake Hiraga 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).

  • Liquid developer and image forming apparatus
    Patent number: 8142973
    Abstract: A liquid developer includes an insulating liquid; toner particles constituted by a material containing a polyester resin; and an alkyl diamine and an amide compound having a hydroxy fatty acid skeleton as dispersants.
    Type: Grant
    Filed: March 9, 2009
    Date of Patent: March 27, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Tomotake Hiraga, Takashi Teshima
  • Photoconductor, photoconductor cartridge and image-forming apparatus
    Patent number: 7955770
    Abstract: The surface of a photoconductor is coated with a surface protection layer comprising a cured material of a fluorine-containing photo-curing composition containing fluorinated alkyl group-containing (meth)acrylate and a photopolymerization initiator, and the surface protection layer has a fluorine atom content of 8.5 to 20% by mass.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: June 7, 2011
    Assignee: Seiko Epson Corporation
    Inventors: Nobuhiro Miyakawa, Shinji Yasukawa, Tomotake Hiraga, Ken Ikuma
  • Liquid Developer and Image Forming Apparatus
    Publication number: 20100074654
    Abstract: A liquid developer includes: toner particles containing a rosin resin; an insulating liquid in which the toner particles are dispersed; and a dispersant having plural cyclic structures containing a secondary amine and/or a tertiary amine.
    Type: Application
    Filed: September 3, 2009
    Publication date: March 25, 2010
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Tomotake HIRAGA, Takashi TESHIMA
  • Liquid Developer and Image Forming Apparatus
    Publication number: 20090233214
    Abstract: A liquid developer includes an insulating liquid; toner particles constituted by a material containing a polyester resin; and an alkyl diamine and an amide compound having a hydroxy fatty acid skeleton as dispersants.
    Type: Application
    Filed: March 9, 2009
    Publication date: September 17, 2009
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Tomotake Hiraga, Takashi Teshima
  • Photoconductor, Photoconductor Cartridge and Image-Forming Apparatus
    Publication number: 20080220354
    Abstract: The surface of a photoconductor is coated with a surface protection layer comprising a cured material of a fluorine-containing photo-curing composition containing fluorinated alkyl group-containing (meth)acrylate and a photopolymerization initiator, and the surface protection layer has a fluorine atom content of 8.5 to 20% by mass.
    Type: Application
    Filed: October 16, 2007
    Publication date: September 11, 2008
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Nobuhiro MIYAKAWA, Shinji YASUKAWA, Tomotake HIRAGA