Patents by Inventor Nobutake Hamada

Nobutake Hamada 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 preparing an optically active .gamma.-halo-.beta.-hydroxybutyric acid ester
    Patent number: 4933282
    Abstract: A process for preparing an optically active .gamma.-halo-.beta.-hydroxybutyric acid ester in high yields which comprises subjecting a .gamma.-haloacetoacetic acid ester to the action of a microorganism selected from genus Saccharomyces under an anaerobic condition. When the .gamma.-haloacetoacetic acid ester is subjected to the action of the microorganism in the presence of a ketal, the yield and optical purity can be further increased.
    Type: Grant
    Filed: November 26, 1986
    Date of Patent: June 12, 1990
    Assignee: Nippon Gohsei Kagaku Kogyo Kabushiki Kaisha
    Inventors: Masayasu Hasegawa, Shigetaka Okada, Nobutake Hamada, Kiyofumi Sakai, You Honda