Patents by Inventor Mitsukuni Ayabe

Mitsukuni Ayabe 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).

  • Process for the preparation of hydantoin precursor of phenylalanine
    Patent number: 4549028
    Abstract: A precursor of phenylalanine containing as a major component 5-benzylhydantoin is prepared by reacting, in an aqueous medium, a bisulfite addition salt of phenylacetaldehyde with cyanide and carbonate ions, each being in a molar ratio of equimol or more to said bisulfite addition salt and ammonium ion in a molar ratio of 2 or more to said carbonate ion.The thus prepared precursor of phenylalanine may be converted into phenylalanine by a hydrolysis under a basic or acidic condition.
    Type: Grant
    Filed: November 16, 1983
    Date of Patent: October 22, 1985
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Mitsukuni Ayabe, Tunehiko Shimizui, Iwao Kibayashi, Hideki Hirano