Patents by Inventor Koji Yoneda

Koji Yoneda 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 preparing D-N-carbamoyl-.alpha.-amino acids
    Patent number: 4237227
    Abstract: A process for preparing D-N-carbamoyl-.alpha.-amino acids by subjecting 5-substituted hydantoins to the action of a cultured broth, cells or treated cells of microorganisms having an ability in asymmetrically hydrolyzing the hydantoin ring in an aqueous medium of pH 7 to 10. The process is suited for the industrial manufacture of D-N-carbamoyl-.alpha.-amino acids which are useful intermediates for the preparation of medicines.
    Type: Grant
    Filed: December 21, 1977
    Date of Patent: December 2, 1980
    Assignee: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hideaki Yamada, Satomi Takahashi, Koji Yoneda
  • Process for preparing 5-(4-hydroxyphenyl)hydantoin
    Patent number: 4230869
    Abstract: A process for preparing 5-(4-hydroxyphenyl)hydantoin by reacting glyoxylic acid, urea and phenol in an aqueous medium in the presence of an acid at an elevated temperature. The hydantoin of high purity can be readily prepared in good yields.
    Type: Grant
    Filed: March 16, 1978
    Date of Patent: October 28, 1980
    Assignee: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
    Inventors: Koji Yoneda, Takehisa Ohashi, Tomoaki Nagamachi, Hirotaka Fukumitsu, Satomi Takahashi
  • Process for preparing 5-(2-thienyl)hydantoin
    Patent number: 4185153
    Abstract: A process for preparing 5-(2-thienyl)hydantoin by reacting glyoxylic acid, urea and thiophene in the presence of an acid at an elevated temperature. The hydantoin of high purity can be readily prepared in good yields.
    Type: Grant
    Filed: March 9, 1979
    Date of Patent: January 22, 1980
    Assignee: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
    Inventors: Takehisa Ohashi, Satomi Takahashi, Koji Yoneda
  • Process for preparing L-methionine
    Patent number: 4148688
    Abstract: A process for preparing L-methionine by subjecting DL- or L-N-carbamoylmethionine to the action of a cultured broth, cells or treated cells of microorganisms having a capability in asymmetrically hydrolyzing the carbamoyl group of N-carbamoylmethionine. The process is suited for large-scale economical manufacturing of L-methionine.
    Type: Grant
    Filed: January 28, 1977
    Date of Patent: April 10, 1979
    Assignee: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hideaki Yamada, Satomi Takahashi, Kazushige Sumino, Hirotaka Fukumitsu, Koji Yoneda
  • Process for preparing D-(-)-N-carbamoyl-2-(phenyl or substituted phenyl)glycines
    Patent number: 4094741
    Abstract: A process for preparing D-(-)-N-carbamoyl-2-(phenyl or substituted phenyl)glycines by subjecting 5-(phenyl or substituted phenyl)hydantoins to the action of a cultured broth, cells or treated cells of microorganisms having a capability in asymmetrically hydrolyzing the hydantoin ring. D-(-)-N-carbamoyl-2-(phenyl or substituted phenyl)glycines are useful intermediates of medicines and can be readily converted to D-(-)-2-(phenyl or substituted phenyl) glycines known as available intermediates of antibiotics.
    Type: Grant
    Filed: February 1, 1977
    Date of Patent: June 13, 1978
    Assignee: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hideaki Yamada, Satomi Takahashi, Koji Yoneda