Patents by Inventor Minoru Hagisawa

Minoru Hagisawa 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 purification of pravastatin
    Publication number: 20030216596
    Abstract: A method of isolating or purifying pravastatin or its pharmaceutically acceptable salt characterized by involving, in the process of isolating or purifying pravastatin or its pharmacologically acceptable salt, the step of extracting pravastatin using an organic solvent represented by the formula CH3CO2R wherein R represents an alkyl group having 3 or more carbon atoms or the step of decomposing impurities using an inorganic acid or an inorganic base; and compositions containing pravastatin sodium thus obtained.
    Type: Application
    Filed: April 16, 2003
    Publication date: November 20, 2003
    Applicant: SANKYO COMPANY LIMITED
    Inventors: Nobunari Sugio, Yasuyuki Takamatsu, Shunshi Kojima, Mutsuo Suzuki, Minoru Hagisawa, Kiyoshi Hamano
  • Method for purification of pravastatin or a pharmacologically acceptable salt thereof
    Publication number: 20030204105
    Abstract: The present invention provides methods for purification of pravastatin or a pharmacologically acceptable salt thereof using a salting-out technique. Inorganic salts are added to an aqueous solution of pravastatin of a pharmacologically acceptable salt thereof which was obtained from culturing of microorganisms, to selectively precipitate the pravastatin or pharmacologically acceptable salt.
    Type: Application
    Filed: April 16, 2003
    Publication date: October 30, 2003
    Applicant: SANKYO COMPANY, LIMITED
    Inventors: Nobunari Sugio, Yasuyuki Takamatsu, Shunshi Kojima, Mutsuo Suzuki, Minoru Hagisawa, Kiyoshi Hamano