Patents by Inventor Zen-Jen Chan

Zen-Jen Chan 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).

  • Computer-controlled bioreactor system for enzymatic synthesis of L-tryptophan
    Patent number: 5629202
    Abstract: Disclosed is an automatic computer-controlled bioreactor system for enzymatic synthesis of L-tryptophan which comprises a bioreactor linked to a computer equipped with an on-line indole assay device, in which the computer controls the feeding of indole, pyruvic acid and/or its salt and an ammonium salt into the bioreactor and feedback-controls the reaction in the bioreactor by indole concentration determined by the on-line indole assay device, wherein the feeding of indole and ammonium salt is controlled by a pre-defined profile that agrees with a tryptophanase activity profile and pyruvic acid and/or its salt is added at a predetermined time.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: May 13, 1997
    Assignee: Development Center for Biotechnology
    Inventors: Chein-Shyong Su, Zen-Jen Chan, Wuen-Hsian Huang, Hsin Tsai