Patents by Inventor Yusaku KIKUCHI

Yusaku KIKUCHI 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).

  • Arylamine-fluorene alternating copolymer, electroluminescence device material, and electroluminescence device using the polymer
    Patent number: 11917899
    Abstract: An arylamine-fluorene alternating copolymer having a structural unit (A) is represented by Chemical Formula (1): wherein Chemical Formula (1) is the same as described in the detailed description.
    Type: Grant
    Filed: March 5, 2021
    Date of Patent: February 27, 2024
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Masashi Tsuji, Takahiro Fujiyama, Yusaku Konishi, Dae Young Chung, Fumiaki Kato, Jaejun Chang, Keigo Furuta, Takao Motoyama, Eun Joo Jang, Hyo Sook Jang, Tae Ho Kim, Tomoyuki Kikuchi, Yuho Won
  • Polymer conjugate of hexa-coordinated platinum complex
    Patent number: 11033577
    Abstract: A DDS preparation of a platinum complex, which selectively releases a highly active platinum complex in cells that are under reducing conditions, and exhibits high antitumor activity that is required from a medicine, is still not available, and there is a demand for a novel DDS preparation of a platinum complex that may be used in clinical fields. There is provided a polymer conjugate of a hexa-coordinated platinum complex, the polymer conjugate comprising a block copolymer having a polyethylene glycol structural moiety and a polyaspartic acid moiety or a polyglutamic acid moiety; and a hexa-coordinated platinum complex having a halogen atom and a hydroxyl group at the axial positions, the hexa-coordinated platinum complex being bonded, directly or via a spacer, to a side-chain carboxyl group of the block copolymer.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: June 15, 2021
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Masaharu Nakamura, Tsuyoshi Fukuda, Yusaku Kikuchi, Chihiro Watanabe
  • Polymer conjugate of hexa-coordinated platinum complex
    Patent number: 10596191
    Abstract: A DDS preparation of a platinum complex, which selectively releases a highly active platinum complex in cells that are under reducing conditions, and exhibits high antitumor activity that is required from a medicine, is still not available, and there is a demand for a novel DDS preparation of a platinum complex that may be used in clinical fields. There is provided a polymer conjugate of a hexa-coordinated platinum complex, the polymer conjugate comprising a block copolymer having a polyethylene glycol structural moiety and a polyaspartic acid moiety or a polyglutamic acid moiety; and a hexa-coordinated platinum complex having a halogen atom and a hydroxyl group at the axial positions, the hexa-coordinated platinum complex being bonded, directly or via a spacer, to a side-chain carboxyl group of the block copolymer.
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: March 24, 2020
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Masaharu Nakamura, Tsuyoshi Fukuda, Yusaku Kikuchi, Chihiro Watanabe
  • Polymer Conjugate Of Hexa-Coordinated Platinum Complex
    Publication number: 20190282612
    Abstract: A DDS preparation of a platinum complex, which selectively releases a highly active platinum complex in cells that are under reducing conditions, and exhibits high antitumor activity that is required from a medicine, is still not available, and there is a demand for a novel DDS preparation of a platinum complex that may be used in clinical fields. There is provided a polymer conjugate of a hexa-coordinated platinum complex, the polymer conjugate comprising a block copolymer having a polyethylene glycol structural moiety and a polyaspartic acid moiety or a polyglutamic acid moiety; and a hexa-coordinated platinum complex having a halogen atom and a hydroxyl group at the axial positions, the hexa-coordinated platinum complex being bonded, directly or via a spacer, to a side-chain carboxyl group of the block copolymer.
    Type: Application
    Filed: June 5, 2019
    Publication date: September 19, 2019
    Inventors: Masaharu Nakamura, Tsuyoshi Fukuda, Yusaku Kikuchi, Chihiro Watanabe
  • Polymer Conjugate Of Hexa-Coordinated Platinum Complex
    Publication number: 20180250332
    Abstract: A DDS preparation of a platinum complex, which selectively releases a highly active platinum complex in cells that are under reducing conditions, and exhibits high antitumor activity that is required from a medicine, is still not available, and there is a demand for a novel DDS preparation of a platinum complex that may be used in clinical fields. There is provided a polymer conjugate of a hexa-coordinated platinum complex, the polymer conjugate comprising a block copolymer having a polyethylene glycol structural moiety and a polyaspartic acid moiety or a polyglutamic acid moiety; and a hexa-coordinated platinum complex having a halogen atom and a hydroxyl group at the axial positions, the hexa-coordinated platinum complex being bonded, directly or via a spacer, to a side-chain carboxyl group of the block copolymer.
    Type: Application
    Filed: September 8, 2016
    Publication date: September 6, 2018
    Inventors: Masaharu Nakamura, Tsuyoshi Fukuda, Yusaku Kikuchi, Chihiro Watanabe
  • Authentication device and method using electronic certificate files having hierarchical relationship
    Patent number: 8473737
    Abstract: This authentication device includes: a volatile memory; a non-volatile memory which stores a plurality of electronic certificate files; a unit which refers to the non-volatile memory upon start-up, and which stores a hierarchical relationship between the plurality of electronic certificate files in the volatile memory; a unit for searching for a desired electronic certificate file based upon the hierarchical relationship between the plurality of electronic certificate files in the volatile memory; and an authentication unit which performs authentication using the electronic certificate file which has been found by the search unit.
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: June 25, 2013
    Assignee: Seiko Epson Corporation
    Inventor: Yusaku Kikuchi
  • Authentication device and method using electronic certificate files having hierarchical relationship
    Publication number: 20090019519
    Abstract: This authentication device includes: a volatile memory; a non-volatile memory which stores a plurality of electronic certificate files; a unit which refers to the non-volatile memory upon start-up, and which stores a hierarchical relationship between the plurality of electronic certificate files in the volatile memory; a unit for searching for a desired electronic certificate file based upon the hierarchical relationship between the plurality of electronic certificate files in the volatile memory; and an authentication unit which performs authentication using the electronic certificate file which has been found by the search unit.
    Type: Application
    Filed: January 18, 2008
    Publication date: January 15, 2009
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Yusaku KIKUCHI