Patents by Inventor Manabu Katsumata

Manabu Katsumata 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 and producing taurine analogues
    Patent number: 5856563
    Abstract: The present invention relates to a process for producing amino/guanidinothiosulfonic acid, which comprises treating a styrenedivinylbenzene copolymer sulfonate of amino/guanidinoethyl disulfoxide into contact with an alkali, selectively eluting amino/guanidinosulfinic acid, then reacting this product in a non-aqueous solvent in the presence of a base, and passing the reaction product through a weakly acidic cation exchange resin column; in accordance with the present invention, hypotaurine, thiotaurine and the like having a high purity can industrially be produced.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: January 5, 1999
    Assignee: Sugo Pharmaceutical Company Limited
    Inventors: Tomoko Ohsumi, Manabu Katsumata, Tomoyasu Tashiro, Saburoh Uchikuga
  • Process for producing taurine analogues
    Patent number: 5679845
    Abstract: The present invention relates to a process for producing amino/guanidinothiosulfonic acid, which comprises treating a styrenedivinylbenzene copolymer sulfonate of amino/guanidinoethyl disulfoxide into contact with an alkali, selectively eluting amino/guanidinosulfinic acid, then reacting this product in a non-aqueous solvent in the presence of a base, and passing the reaction product through a weakly acidic cation exchange resin column; in accordance with the present invention, hypotaurine, thiotaurine and the like having a high purity can industrially be produced.
    Type: Grant
    Filed: August 14, 1996
    Date of Patent: October 21, 1997
    Assignee: Sogo Pharmaceutical Company Limited
    Inventors: Tomoko Ohsumi, Manabu Katsumata, Tomoyasu Tashiro, Saburoh Uchikuga
  • Methods for scavenging active oxygen compounds and preventing damage from ultra violet B rays using taurine analogues
    Patent number: 5601806
    Abstract: Taurine analogues are used for scavenging active oxygen compounds and preventing and minimizing damage to the skin from ultraviolet rays. The taurine analogues have the following formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined in the specification.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: February 11, 1997
    Assignee: Sogo Pharmaceutical Company Limited
    Inventors: Manabu Katsumata, Keiko Kiuchi, Tomoyasu Tashiro, Saburo Uchikuga
  • Pyrroloquinoline quinone compounds useful as an enzyme inhibitor
    Patent number: 4898870
    Abstract: The present invention concerns an enzyme inhibitor containing the compound represented by the following formula (I) as an effective ingredient: ##STR1## where R represents hydrogen or substituted or not substituted alkyl group, alkenyl group, aryl group or aralkyl group, X represents OR' or NR"R"', in which R', R" and R'" represent respectively hydrogen or substituted or not substituted alkyl group, alkenyl group, aryl group or aralkyl group.The enzyme inhibitor according to the present invention can effectively inhibit aldose reductase, glyoxalase I and reverse transcriptase.
    Type: Grant
    Filed: January 19, 1989
    Date of Patent: February 6, 1990
    Assignee: Sogo Pharmaceutical Company Limited
    Inventors: Yuji Narutomi, Manabu Katsumata, Yasuko Osawa, Saburo Uchikuga