Patents by Inventor Takehiko Susuki

Takehiko Susuki 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).

  • Intermediates for synthesizing BH.sub.4 and its derivatives
    Patent number: 4937342
    Abstract: The present invention relates to intermediates for synthesizing BH.sub.4 and derivatives thereof. The intermediates are shown as follows: ##STR1## wherein R.sub.1 is a hydrogen atom, alkyl, aralkyl, or aryl group; R.sub.2 is an alkyl, hydroxyalkyl, or polyhydroxyalkyl group; R.sub.3 and R.sub.4 are the same or different and represent alkyl, aralkyl, or aryl group; R.sub.5, R.sub.6, R.sub.7, and R.sub.8 are the same or different and represent a hydrogen atom or acyl group; R.sub.9 is an alkyl, aralkyl, or aryl group; R.sub.10 and R.sub.11 are the same or different and represent a hydrogen atom or acyl group; n is an integer of 5 or less; and HX is an acid. The invention also relates to a process for the preparation of L-biopterin.
    Type: Grant
    Filed: November 29, 1988
    Date of Patent: June 26, 1990
    Assignee: Kabushiki Kaisha Vitamin Kenkyusyo
    Inventors: Masayasu Kurono, Takehiko Susuki, Tomio Ogasawara, Nobuko Ohishi, Kunio Yagi