Patents by Inventor Koutaro Ohtsuka

Koutaro Ohtsuka 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).

  • Method for producing optically active 1-(4-t-butylphenyl)-5-oxo-3-pyrrolidine carboxylic acid and/or an enantiomeric ester thereof
    Patent number: 6391597
    Abstract: A method for producing an optically active 1-(4-t-butylphenyl)-5-oxo-3-pyrrolidine carboxylic acid and/or an enantiomeric ester thereof which includes treating an ester of (±)-1-(4-t-butylphenyl)-5-oxo-3-pyrrolidine carboxylic acid with an esterase derived from Bacillus brevis 042-24 (FERM BP-5872).
    Type: Grant
    Filed: April 25, 2000
    Date of Patent: May 21, 2002
    Assignees: Nagase & Company, Ltd., Taiho Pharmaceutical Co., Ltd.
    Inventors: Koutaro Ohtsuka, Shunji Kamiyama, Masafumi Moriwaki