Patents by Inventor Masayuki Oya

Masayuki Oya 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).

  • Disulfide compounds
    Patent number: 4347371
    Abstract: Disulfide compounds which have the general formula ##STR1## and salts thereof used for reducing blood pressure and for preventing or relieving diabetic complications, processes for manufacturing thereof, compositions comprising them and pharmaceutically acceptable excipients, and administering methods are mentioned.
    Type: Grant
    Filed: December 18, 1979
    Date of Patent: August 31, 1982
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Jun-ichi Iwao, Masayuki Oya, Tadashi Iso
  • Cysteine derivatives
    Patent number: 4305958
    Abstract: This invention relates to the compounds: N-(mercaptoacy)-cysteine represented by the following formula wherein Z is selected from the group consisting of CH.sub.3 --CH<, (CH.sub.3).sub.2 C<, (CH.sub.2).sub.2 < and CH.sub.2 <, acting as agents for the liquefaction of sputum, intermediate therefor and a process for manufacture thereof.
    Type: Grant
    Filed: February 24, 1977
    Date of Patent: December 15, 1981
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Tadashi Fujita, Masayuki Oya, Hideo Takashina, Tadashi Iso
  • Antihypertensive 5-substituted 2-pyrrolidinecarboxylic acids
    Patent number: 4264620
    Abstract: Derivatives of 5-substituted 2-pyrrolidinecarboxylic acid which have the general formula ##STR1## are useful in compositions as antihypertensive agents.
    Type: Grant
    Filed: July 23, 1979
    Date of Patent: April 28, 1981
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Jun-ichi Iwao, Masayuki Oya, Eishin Kato, Yoichi Kawashima, Hiroshi Masuda, Tadashi Iso, Takihisa Chiba
  • Cysteine derivatives
    Patent number: 4255446
    Abstract: S-Substituted derivatives of N-(2-mercapto-2-methylpropanoyl)-cysteine which have the formula ##STR1## are useful as a medicine for suppressing liver disorders.
    Type: Grant
    Filed: October 5, 1979
    Date of Patent: March 10, 1981
    Assignee: Santen Pharmaceutical Co. Ltd.
    Inventors: Jun-ichi Iwao, Masayuki Oya, Takehisa Chiba
  • Antiarteriosclerotic N-(mercaptoacyl)-histidines
    Patent number: 4233310
    Abstract: This invention relates to the compound: N-(mercaptoacyl)-histidine represented by the following formula wherein n is 1 or 2, having activity as an antiarteriosclerosis agent, the intermediate thereof and a process for manufacture thereof.
    Type: Grant
    Filed: February 24, 1977
    Date of Patent: November 11, 1980
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Tadashi Fujita, Masayuki Oya, Toshio Watanabe, Takehisa Chiba
  • Process for manufacturing optically active sulfur-containing carboxylic acid
    Patent number: 4224457
    Abstract: Process for manufacturing optically active sulfur-containing carboxylic acid which comprises reacting a racemic acid of the formula ##STR1## with an optically active amine to form the amine salt, and then resolving the isomers and recovering the optically active isomer.
    Type: Grant
    Filed: May 4, 1979
    Date of Patent: September 23, 1980
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Jun-ichi Iwao, Masayuki Oya, Eishin Kato, Toshio Watanabe
  • Cysteine derivatives
    Patent number: 4137420
    Abstract: This invention relates to the compounds: N-(mercaptoacy)-cysteine represented by the following formula wherein Z is selected from the group consisting of CH.sub.3 --CH<, (CH.sub.3).sub.2 C<, (CH.sub.2).sub.2 < and CH.sub.
    Type: Grant
    Filed: February 23, 1978
    Date of Patent: January 30, 1979
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Tadashi Fujita, Masayuki Oya, Hideo Takashina, Tadashi Iso