Patents by Inventor Takuto UMEZU

Takuto UMEZU 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 of producing epirubicin and novel production intermediate thereof
    Patent number: 10301343
    Abstract: According to the present invention, it is possible to efficiently remove 13-dihydroepi-daunorubicin and 4?-epi-feudomycin, which are typical impurities possibly contained in 4?-epi-daunorubicin as a starting material, by using an organic acid salt of 4?-epi-daunorubicin or a hydrate or solvate thereof as a novel production intermediate, thus making it possible to produce high-purity epirubicin.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: May 28, 2019
    Assignee: MEIJI SEIKA PHARMA CO., LTD.
    Inventors: Kenichiro Mori, Takuto Umezu, Takahisa Maruyama, Sojiro Shiokawa
  • METHOD OF PRODUCING EPIRUBICIN AND NOVEL PRODUCTION INTERMEDIATE THEREOF
    Publication number: 20180094014
    Abstract: According to the present invention, it is possible to efficiently remove 13-dihydroepi-daunorubicin and 4?-epi-feudomycin, which are typical impurities possibly contained in 4?-epi-daunorubicin as a starting material, by using an organic acid salt of 4?-epi-daunorubicin or a hydrate or solvate thereof as a novel production intermediate, thus making it possible to produce high-purity epirubicin.
    Type: Application
    Filed: March 30, 2016
    Publication date: April 5, 2018
    Applicant: MEIJI SEIKA PHARMA CO., LTD.
    Inventors: Kenichiro MORI, Takuto UMEZU, Takahisa MARUYAMA, Sojiro SHIOKAWA