Patents by Inventor Yoichi Koiwa

Yoichi Koiwa 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 the production of foods and beverages
    Patent number: 5520933
    Abstract: The present invention relates to a method for producing foods and beverages having a desirable flavor which comprises bringing an animal-derived, ethyl butyrate-synthesizing enzyme having a potency in the range of 0.1 unit/mg protein or higher under the conditions that ethyl butyrate is formed by reacting 0.5% (w/w) ethanol with 2.6% (w/w) butyric acid, or a substance containing the enzyme into contact with the foods and beverages during their production process.
    Type: Grant
    Filed: July 8, 1993
    Date of Patent: May 28, 1996
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Nobuko Yoshida, Nobuo Ogata, Makoto Egi, Hideo Muromachi, Yoichi Koiwa, Shigenori Ohta
  • Process for preparing N-carboxylic anhydrides of amino acids
    Patent number: 3936469
    Abstract: This invention relates to an improved process for preparing N-carboxylic anhydrides of amino acids, and N-carboxylic anhydrides of derivatives of amino acids by reacting an amino acid, a derivative of amino acid or a salt thereof with trichloromethylchloroformate in an organic solvent, preferably a mixture of an ether or ester with one or more other organic solvents and adding to the reaction mixture carbon, basic aluminum chloride or aluminum oxide just before or immediately after completion of the initial reaction.
    Type: Grant
    Filed: November 12, 1973
    Date of Patent: February 3, 1976
    Assignee: Kyowa Hakko Kogyo Kabushiki Kaisha
    Inventors: Yasuo Fujimoto, Keizo Tatsukawa, Yoichi Koiwa, Akira Miike, Tatsuo Nomura, Shohei Kobayashi