Patents by Inventor Koichi Nakata

Koichi Nakata 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: 20190369511
    Abstract: An electrophotographic photosensitive member includes a support and a surface layer, in which the surface layer contains a copolymer of a composition which contains at least a compound represented by the following general formula (1) and a compound represented by the following general formula (2), a content of the compound represented by the general formula (1) in the composition is 25 mass % or more and 70 mass % or less with respect to a total content of the compound represented by the general formula (1) and the compound represented by the general formula (2), and the total content of the compound represented by the general formula (1) and the compound represented by the general formula (2) is 55 mass % or more with respect to a total mass of the composition.
    Type: Application
    Filed: May 28, 2019
    Publication date: December 5, 2019
    Inventors: Yuka Ishiduka, Tsutomu Nishida, Atsushi Okuda, Hiroyuki Watanabe, Hideharu Shimozawa, Nobuhiro Nakamura, Kenichi Kaku, Daisuke Miura, Koichi Nakata, Masaki Nonaka, Koji Takahashi, Haruki Mori
  • Publication number: 20190369516
    Abstract: An electrophotographic photosensitive member suppressing potential variation due to repeated use is provided. The electrophotographic photosensitive member is an electrophotographic photosensitive member including a support, a photosensitive layer and a protective layer in this order, wherein the protective layer contains: a resin including a structure represented by a general formula (1) and a structure represented by a general formula (2); and a compound represented by a general formula (3), the molar ratio of the proportion of the structure represented by the general formula (2) to the proportion of the structure represented by the general formula (1) in the resin is 0.0002 to 0.1000 in a molar ratio, and the molar ratio of the content of the compound represented by the general formula (3) to the content of the structure represented by the general formula (1) in the resin in the protective layer is 0.0002 to 0.1000 in a molar ratio.
    Type: Application
    Filed: May 28, 2019
    Publication date: December 5, 2019
    Inventors: Nobuhiro Nakamura, Tsutomu Nishida, Atsushi Okuda, Yuka Ishiduka, Hiroyuki Watanabe, Hideharu Shimozawa, Kenichi Kaku, Koichi Nakata, Haruki Mori
  • Publication number: 20190369514
    Abstract: A method for producing an electrophotographic photosensitive member having a photosensitive layer and a protective layer above a support in this order includes: forming a coating film for a protective layer by coating a coating liquid for the protective layer for forming the protective layer on the photosensitive layer and curing the coating film for the protective layer, in which the coating liquid for the protective layer contains a solvent, a compound represented by a general formula (1), a compound represented by a general formula (2), and a compound represented by a general formula (3) at a specific ratio. In addition, in an electrophotographic photosensitive member having a photosensitive layer and a protective layer above a support in this order, the protective layer is obtained by curing a coating liquid for the protective layer.
    Type: Application
    Filed: May 28, 2019
    Publication date: December 5, 2019
    Inventors: Hiroyuki Watanabe, Tsutomu Nishida, Yuka Ishiduka, Atsushi Okuda, Hideharu Shimozawa, Nobuhiro Nakamura, Koichi Nakata, Haruki Mori, Kenichi Kaku
  • Publication number: 20190361365
    Abstract: Provided is an electrophotographic photosensitive member that suppresses image smearing at the time of its repeated use, and expresses satisfactory wear resistance and electric characteristics. The electrophotographic photosensitive member includes a support and a photosensitive layer in the stated order, wherein a surface layer of the electrophotographic photosensitive member contains a copolymer of a hole-transportable compound having a chain-polymerizable functional group and a specific compound having maleimide groups.
    Type: Application
    Filed: May 20, 2019
    Publication date: November 28, 2019
    Inventors: Haruki Mori, Koichi Nakata, Masaki Nonaka, Shinji Takagi
  • Patent number: 10488769
    Abstract: Provided is an electrophotographic photosensitive member, wherein a surface layer of the electrophotographic photosensitive member contains a copolymer of a hole-transportable compound having a polymerizable functional group and a compound represented by the following general formula (1).
    Type: Grant
    Filed: August 13, 2018
    Date of Patent: November 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koichi Nakata, Shinji Takagi, Haruki Mori, Masaki Nonaka, Shubun Kujirai
  • Patent number: 10488771
    Abstract: A surface layer of an electrophotographic photosensitive member contains a cured product of a composition containing a hole transport compound having an acryloyloxy group or a methacryloyloxy group, and a compound having a specific structure.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: November 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Haruki Mori, Masaki Nonaka, Koichi Nakata, Shinji Takagi
  • Patent number: 10490964
    Abstract: A method of manufacturing a crimping terminal includes a punching process of punching out a crimping terminal from a flat-plate-shaped metal base material, an attaching process of attaching a sheet-like water stop member to a wire connection portion being a portion in the crimping terminal that is to be crimped onto a wire, and a bending process of bending the wire connection portion to which the water stop member is attached. The wire connection portion may integrally cover a core wire and a covering of the wire by being crimped onto the wire.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: November 26, 2019
    Assignee: YAZAKI CORPORATION
    Inventors: Koichi Ikebe, Masashi Iwata, Junya Shinohara, Hirohito Nakata, Hideki Saito, Syunsuke Yaoita
  • Patent number: 10473820
    Abstract: There is provided a compound containing a mesogenic group, which includes a silicon compound at a low concentration, a polymerizable compound containing the mesogenic group, a mixture and a composition using these compounds, a polymerizable mixture having the polymerizable compound, and a polymer, an optically anisotropic body, and a phase difference film using the polymerizable composition. It is possible to obtain the optically anisotropic body and the phase difference film having satisfactory scratch resistance and adhesion, by using the polymerizable composition composed of the compound containing a mesogenic group, which includes a silicon compound at a low concentration.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: November 12, 2019
    Assignee: DIC CORPORATION
    Inventors: Mika Yamamoto, Yasuhiro Kuwana, Hidetoshi Nakata, Koichi Endou, Kunihiko Kotani, Hiroshi Hasebe, Yoshiyuki Ono
  • Patent number: 10451984
    Abstract: A coating film of a coating liquid for a surface layer, the coating liquid containing a hole transporting compound having a chain-polymerizable functional group and a compound having a specified structure, is cured to thereby form a surface layer of an electrophotographic photosensitive member.
    Type: Grant
    Filed: May 3, 2018
    Date of Patent: October 22, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Haruki Mori, Masaki Nonaka, Shinji Takagi, Koichi Nakata
  • Patent number: 10310395
    Abstract: Provided are an electrophotographic photosensitive member capable of satisfying abrasion resistance and electrical properties and suppressing image deletion, and an electrophotographic apparatus and a process cartridge having the electrophotographic photosensitive member. A surface layer of the electrophotographic photosensitive member contains a polymer of a hole transport material having a polymerizable functional group, wherein the hole transport material has a specific structure.
    Type: Grant
    Filed: June 7, 2018
    Date of Patent: June 4, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koichi Nakata, Haruki Mori, Shinji Takagi, Masaki Nonaka, Ryoichi Tokimitsu
  • Publication number: 20190094726
    Abstract: A surface layer of an electrophotographic photosensitive member contains a cured product of a composition containing a hole transport compound having an acryloyloxy group or a methacryloyloxy group, and a compound having a specific structure.
    Type: Application
    Filed: September 20, 2018
    Publication date: March 28, 2019
    Inventors: Haruki Mori, Masaki Nonaka, Koichi Nakata, Shinji Takagi
  • Publication number: 20190056676
    Abstract: Provided is an electrophotographic photosensitive member, wherein a surface layer of the electrophotographic photosensitive member contains a copolymer of a hole-transportable compound having a polymerizable functional group and a compound represented by the following general formula (1).
    Type: Application
    Filed: August 13, 2018
    Publication date: February 21, 2019
    Inventors: Koichi Nakata, Shinji Takagi, Haruki Mori, Masaki Nonaka, Shubun Kujirai
  • Publication number: 20180335708
    Abstract: The present invention relates to an electrophotographic photosensitive member in which a surface layer contains a polymer of a hole transport material having a polymerizable functional group, and the hole transport material has a specific fluorene structure.
    Type: Application
    Filed: May 16, 2018
    Publication date: November 22, 2018
    Inventors: Koichi Nakata, Haruki Mori, Shinji Takagi, Koichi Suzuki, Ryuji Higashi, Isao Kawata, Hajime Muta, Yuto Ito, Masaki Nonaka
  • Publication number: 20180329317
    Abstract: A coating film of a coating liquid for a surface layer, the coating liquid containing a hole transporting compound having a chain-polymerizable functional group and a compound having a specified structure, is cured to thereby form a surface layer of an electrophotographic photosensitive member.
    Type: Application
    Filed: May 3, 2018
    Publication date: November 15, 2018
    Inventors: Haruki Mori, Masaki Nonaka, Shinji Takagi, Koichi Nakata
  • Patent number: 10120331
    Abstract: The present invention provides a satisfactory electrophotographic photosensitive member which satisfies wear resistance and electrical properties and further, with which image defects do not occur, a process for producing an electrophotographic photosensitive member, and an electrophotographic apparatus and a process cartridge each including the electrophotographic photosensitive member. The electrophotographic photosensitive member the surface layer of which contains a copolymer of a polymerizable functional group-containing charge transporting substance and a particular polymerizable compound.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: November 6, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koichi Nakata, Shinji Takagi, Masaki Nonaka, Haruki Mori
  • Publication number: 20180284629
    Abstract: Provided are an electrophotographic photosensitive member capable of satisfying abrasion resistance and electrical properties and suppressing image deletion, and an electrophotographic apparatus and a process cartridge having the electrophotographic photosensitive member. A surface layer of the electrophotographic photosensitive member contains a polymer of a hole transport material having a polymerizable functional group, wherein the hole transport material has a specific structure.
    Type: Application
    Filed: June 7, 2018
    Publication date: October 4, 2018
    Inventors: Koichi Nakata, Haruki Mori, Shinji Takagi, Masaki Nonaka, Ryoichi Tokimitsu
  • Patent number: 10067431
    Abstract: An electrophotographic photosensitive member, in which occurrences of image defects are suppressed, and a method for manufacturing the electrophotographic photosensitive member are provided. In addition, a process cartridge and an electrophotographic apparatus, which include the electrophotographic photosensitive member, are provided. The surface layer of the electrophotographic photosensitive member contains a cured material, and the cured material is a copolymer of a hole transport compound having a chain-polymerizable functional group and a vinyl ester compound containing a long-chain alkyl group.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: September 4, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shinji Takagi, Masaki Nonaka, Haruki Mori, Ryoichi Tokimitsu, Koichi Nakata
  • Patent number: 10042272
    Abstract: To provide an electrophotographic photosensitive member being excellent in abrasion resistance and having good electrical characteristics. The surface layer of the electrophotographic photosensitive member contains a copolymerized product of a hole transporting compound having a specified structure and a compound having a specified structure.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: August 7, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Haruki Mori, Shinji Takagi, Masaki Nonaka, Koichi Nakata
  • Patent number: 9946175
    Abstract: To provide an electrophotographic photosensitive member which satisfies abrasion resistance and electrical properties and which is difficult to cause image deletion. A surface layer of the electrophotographic photosensitive member of this invention contains a polymerized product of a hole transporting compound having a polymerizable functional group, in which the hole transporting compound is at least one compound selected from the group consisting of: a compound consisting of one or more carbon atoms, one or more hydrogen atoms, and one or more halogen atoms; and a compound consisting of one or more carbon atoms, one or more hydrogen atoms, one or more oxygen atoms, and one or more halogen atoms.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: April 17, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koichi Nakata, Shinji Takagi, Yuzo Tokunaga, Masaki Nonaka, Ryoichi Tokimitsu
  • Publication number: 20180059566
    Abstract: Provided is a UV-curable liquid developer remaining in an apparatus hardly cures with visible light even when the apparatus is opened for the purpose of, for example, its maintenance, and the UV-curable liquid developer shows sufficient fixability by irradiation of the UV light. The UV-curable liquid developer includes: toner particles; a polymerization initiator; a sensitizer; and a polymerizable monomer, in which the sensitizer contains a compound represented by X—Y, where X represents a triphenylenyl group or the like and Y represents a triphenylenyl group or the like.
    Type: Application
    Filed: May 24, 2016
    Publication date: March 1, 2018
    Inventors: Hiroshi Tanabe, Junji Ito, Yasuhiro Aichi, Jun Shirakawa, Koichi Nakata