Patents by Inventor Iwao Kibayashi

Iwao Kibayashi 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 the preparation of hydantoin precursor of phenylalanine
    Patent number: 4549028
    Abstract: A precursor of phenylalanine containing as a major component 5-benzylhydantoin is prepared by reacting, in an aqueous medium, a bisulfite addition salt of phenylacetaldehyde with cyanide and carbonate ions, each being in a molar ratio of equimol or more to said bisulfite addition salt and ammonium ion in a molar ratio of 2 or more to said carbonate ion.The thus prepared precursor of phenylalanine may be converted into phenylalanine by a hydrolysis under a basic or acidic condition.
    Type: Grant
    Filed: November 16, 1983
    Date of Patent: October 22, 1985
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Mitsukuni Ayabe, Tunehiko Shimizui, Iwao Kibayashi, Hideki Hirano
  • Process for preparing L-threonine
    Patent number: 4492757
    Abstract: Disclosed is a process for preparing L-threonine which comprises causing D-threonine-aldolase, or D-threonine-aldolase and L-allothreonine-aldolase to act on a solution containing at least DL-threonine thereby obtaining L-threonine from a mixture containing at least DL-threonine.
    Type: Grant
    Filed: December 13, 1982
    Date of Patent: January 8, 1985
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Masaaki Kato, Teruzo Miyoshi, Iwao Kibayashi, Masahisa Ikemi, Haruo Gomi, Yoshiaki Ishimatsu, Noriaki Koizumi, Hideaki Yamada
  • Cement composition containing dextrin
    Patent number: 4302251
    Abstract: A cement composition is provided which comprises a cement, and 0.1 to 2.5% by weight, based on the weight of said cement, of a dextrin having a cold-water solubility of from 10 to 80% by weight. The cement composition of the invention suppresses heat of hydration, so that the cement mortar or concrete do not crack due to the heat of hydration.
    Type: Grant
    Filed: November 26, 1979
    Date of Patent: November 24, 1981
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hideyuki Udagawa, Tetsuya Ando, Iwao Kibayashi
  • Method for preparation of citraconic acid and derivatives thereof
    Patent number: 3931241
    Abstract: A method of preparing citraconic acid and derivatives thereof comprising reacting methylsuccinic acid and derivatives thereof (such as an acid halide, an acid anhydride, a monoester and a diester) with chlorine in the absence of or in the presence of a catalyst at a temperature ranging from about 100.degree. to 500.degree.C.
    Type: Grant
    Filed: August 30, 1974
    Date of Patent: January 6, 1976
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Chiyuki Fujii, Yoshio Kosai, Iwao Kibayashi