Patents by Inventor Nobuaki Tsubakihara

Nobuaki Tsubakihara 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).

  • Processes for producing pyrazoloacridone derivative and synthetic intermediate thereof
    Publication number: 20060217554
    Abstract: (wherein R represents lower alkyl; R1 represents a hydrogen atom, —CH2X or —OC(?O)R3; and R2 represents a hydrogen atom, nitro, halogen, substituted or unsubstituted lower alkyl, substituted or unsubstituted lower alkoxy, substituted or unsubstituted lower alkylthio or substituted or unsubstituted aryl) The present invention provides a simple industrial process for producing pyrazoloacridone derivatives having an antitumor activity, 1-(2-carboxyphenyl)indazole derivatives, which are useful as synthetic intermediates thereof, or the like; and the like.
    Type: Application
    Filed: April 23, 2004
    Publication date: September 28, 2006
    Applicant: KYOWA HAKKO KOGYO CO., LTD.
    Inventors: Nobuaki Tsubakihara, Takeshi Katsuhira, Masahiko Kinugawa, Nobuyuki Kato