Patents by Inventor Tadashi Shirakawa

Tadashi Shirakawa 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).

  • System for determining the concentration of an L-amino acid in fermentation
    Patent number: 4384936
    Abstract: Electrochemical method for determining the concentration of a carbon source and L-amino acid in a fermentation medium or cultured broth by contacting a microbial electrode consisting of an oxygen-sensitive electrode or a carbon dioxide gas-sensitive electrode combined with fixed microbial cells of a microorganism capable of assimilating said carbon source or decarboxylating said L-amino acid with a sample solution and sensing electrically the rate of current decrease which is caused by the consumed oxygen in the solution in proportion to the concentration of carbon source; or the electric motive force which is caused by the liberation of carbon dioxide in the sample solution in proportion to the concentration of L-amino acid. Microbial electrodes and systems useful in carrying out the aforementioned method are disclosed.
    Type: Grant
    Filed: February 24, 1981
    Date of Patent: May 24, 1983
    Assignee: Ajinomoto Company, Incorporated
    Inventors: Haruo Obana, Tadashi Shirakawa, Motohiko Hikuma, Takeo Yasuda, Isao Karube, Shuichi Suzuki
  • Method for determining the concentration of an L-amino acid in fermentation
    Patent number: 4299669
    Abstract: Electrochemical method for determining the concentration of a carbon source and L-amino acid in a fermentation medium or cultured broth by contacting a microbial electrode consisting of an oxygen-sensitive electrode or a carbon dioxide gas-sensitive electrode combined with fixed microbial cells of a micro-organism capable of assimilating said carbon source or decarboxylating said L-amino acid with a sample solution and sensing electrically the rate of current decrease which is caused by the consumed oxygen in the solution in proportion to the concentration of carbon source; or the electric motive force which is caused by the liberation of carbon dioxide in the sample solution in proportion to the concentration of L-amino acid. Microbial electrodes and systems useful in carrying out the aforementioned method.
    Type: Grant
    Filed: March 27, 1979
    Date of Patent: November 10, 1981
    Assignee: Ajinomoto Company, Incorporated
    Inventors: Haruo Obana, Tadashi Shirakawa, Motohiko Hikuma, Takeo Yasuda, Isao Karube, Shuichi Suzuki