Patents by Inventor Kei Kurahashi

Kei Kurahashi 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).

  • Method for producing antibody-drug conjugate
    Patent number: 11945882
    Abstract: Crystals of the compound represented by formula (1), a method for the production thereof, and a method for producing an antibody-drug conjugate using the crystals.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: April 2, 2024
    Assignee: DAIICHI SANKYO COMPANY, LIMITED
    Inventors: Tatsuya Yamaguchi, Takashi Kouko, Shigeru Noguchi, Yohei Yamane, Fumikatsu Kondo, Takahiro Aoki, Tadahiro Takeda, Kohei Sakanishi, Hitoshi Sato, Tsuyoshi Ueda, Shinji Matuura, Kei Kurahashi, Yutaka Kitagawa, Tatsuya Nakamura
  • METHOD FOR PRODUCING BICYCLIC PHOSPHORAMIDITE
    Publication number: 20230348522
    Abstract: The present invention provides a crystalline 2,4-bridged common intermediate useful for producing a plurality of ENA monomers, a method for stereoselectively producing the intermediate, and a method for efficiently producing ENA monomers using the intermediate.
    Type: Application
    Filed: October 16, 2020
    Publication date: November 2, 2023
    Applicant: DAIICHI SANKYO COMPANY, LIMITED
    Inventors: Makoto Michida, Kazutoshi Ukai, Yuzo Abe, Moe Matsumoto, Makoto Yamaoka, Kei Kurahashi
  • METHOD FOR PRODUCING ANTIBODY-DRUG CONJUGATE
    Publication number: 20200385422
    Abstract: Crystals of the compound represented by formula (1), a method for the production thereof, and a method for producing an antibody-drug conjugate using the crystals.
    Type: Application
    Filed: August 30, 2018
    Publication date: December 10, 2020
    Applicant: DAIICHI SANKYO COMPANY, LIMITED
    Inventors: Tatsuya YAMAGUCHI, Takashi KOUKO, Shigeru NOGUCHI, Yohei YAMANE, Fumikatsu KONDO, Takahiro AOKI, Tadahiro TAKEDA, Kohei SAKANISHI, Hitoshi SATO, Tsuyoshi UEDA, Shinji MATUURA, Kei KURAHASHI, Yutaka KITAGAWA, Tatsuya NAKAMURA
  • Method for producing silylenol ethers
    Patent number: 8809567
    Abstract: The invention relates to a method for producing silyl enol ether compound (3) by reacting ketone or aldehyde compound (1) with allylsilane compound (2) in the presence of a base and 0.00001 to 0.5 equivalents of an acid catalyst relative to ketone or aldehyde compound (1).
    Type: Grant
    Filed: March 3, 2011
    Date of Patent: August 19, 2014
    Assignee: Kyoto University
    Inventors: Kiyosei Takasu, Yoshiji Takemoto, Kei Kurahashi
  • METHOD FOR PRODUCING SILYLENOL ETHERS
    Publication number: 20130053567
    Abstract: The invention relates to a method for producing silyl enol ether compound (3) by reacting ketone or aldehyde compound (1) with allylsilane compound (2) in the presence of a base and 0.00001 to 0.5 equivalents of an acid catalyst relative to ketone or aldehyde compound (1).
    Type: Application
    Filed: March 3, 2011
    Publication date: February 28, 2013
    Applicant: KYOTO UNIVERSITY
    Inventors: Kiyosei Takasu, Yoshiji Takamoto, Kei Kurahashi