Patents by Inventor Takuma Ikeda

Takuma Ikeda 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).

  • CRYSTAL OF SPIROKETAL DERIVATIVES AND PROCESS FOR PREPARATION OF SPIROKETAL DERIVATIVES
    Publication number: 20110306778
    Abstract: The present invention provides a process for preparing a spiroketal derivative, via an intermediate represented by Formula (VI): wherein variable groups and numbers are as defined in the specification, which can be produced from dihalobenzene derivatives in one pot reaction.
    Type: Application
    Filed: June 19, 2009
    Publication date: December 15, 2011
    Inventors: Masatoshi Murakata, Takuma Ikeda, Nobuaki Kimura, Akira Kawase, Masahiro Nagase, Keisuke Yamamoto
  • PROCESS FOR PRODUCING VITAMIN D DERIVATIVE USING PHOTOREACTION
    Publication number: 20100261917
    Abstract: There are provided a novel process for producing [{(5Z,7E)-(1S,3R,20S)-1,3-dihydroxy-9,10-secopregna-5,7,10(19),16-tetraen-20-yl}oxy]-N-(2,2,3,3,3-pentafluoropropyl)acetamide, which process is characterized by irradiating a compound represented by the formula: with UV to ring-open the compound, and then isomerizing the resulting compound; an intermediate useful for carrying out the process; and a process for producing the intermediate.
    Type: Application
    Filed: November 30, 2006
    Publication date: October 14, 2010
    Applicant: CHUGAI SEIYAKU KABUSHIKI KAISHA
    Inventors: Akira Kawase, Yasuharu Kato, Kazutomo Kinoshita, Yasushi Kitoh, Takuma Ikeda, Tsuyoshi Haneishi, Noriaki Maruyama, Mio Kobayashi