Patents by Inventor Keizo Matsuda

Keizo Matsuda 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 producing .alpha.-L-aspartyl-L-phenylalanine methyl ester or its hydrohalide
    Patent number: 4634790
    Abstract: A process for producing .alpha.-L-aspartyl-L-phenylalanine methyl ester or its hydrohalide, which comprises subjecting 3-benzyl-6-carboxymethyl-2,5-diketopiperazine to partial hydrolysis with a strong acid in a solvent mixture of methanol and water.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: January 6, 1987
    Assignee: Ajinomoto Co., Inc.
    Inventors: Emiko Shinohara, Katsumi Sugiyama, Masanao Ozaki, Keizo Matsuda
  • Process for producing 2-amino-(2)-thiazoline-4-carboxylic acid
    Patent number: 4072687
    Abstract: 2-Amino-(2)-thiazoline-4-carboxylic acid is prepared by dehydrochlorinating S-(.beta.-carboxy-.beta.-chloroethyl) isothiourea by adding it to an aqueous medium maintained at a pH ranging from 5.5 to 7.5 with an alkali.
    Type: Grant
    Filed: November 1, 1976
    Date of Patent: February 7, 1978
    Assignee: Ajinomoto Co., Inc.
    Inventors: Kazushi Togo, Fumihide Tamura, Naohiko Yasuda, Takehiko Ichikawa, Konosuke Sano, Keizo Matsuda, Koji Mitsugi
  • Method of producing L-cysteine and L-cystine
    Patent number: 4006057
    Abstract: A method for producing L-cysteine and/or L-cystine which comprises:A. holding 2-amino-thiazoline-4-carboxylic acid in an aqueous solution at a pH of 5 to 11 in the presence of an effective amount of enzyme produced by a microorganism; said enzyme being capable of converting the 2-amino-thiazoline-4-carboxylic acid to L-cysteine and/or L-cystine, and said microorganism being capable of growing in a medium containing 2-amino-thiazoline-4-carboxylic acid as a nitrogen source; andB. recovering the L-cysteine and/or L-cystine formed from said aqueous solution.
    Type: Grant
    Filed: November 4, 1975
    Date of Patent: February 1, 1977
    Assignee: Ajinomoto Co., Inc.
    Inventors: Konosuke Sano, Keizo Matsuda, Koji Mitsugi, Kazuhiko Yamada, Fumihide Tamura, Naohiko Yasuda, Ichiro Noda
  • Enzymatic method for producing aromatic ethylamines
    Patent number: 3930948
    Abstract: A decarboxylase in cells of Micrococcus strains converts tryptophan, phenylalanine, and substitution products thereof to the corresponding phenyl- and indolylethylamines. The enzyme can be recovered in pure state from the microorganisms, but cells and cell material are effective enzyme sources in the decarboxylation reaction.
    Type: Grant
    Filed: July 29, 1974
    Date of Patent: January 6, 1976
    Assignee: Ajinomoto Co., Inc.
    Inventors: Konosuke Sano, Keizo Matsuda, Hidetsugu Nakazawa, Koji Mitsugi