Patents Assigned to Chisso Cororation
  • Chemically modified hyaluronic acid or salts thereof, and a process for producing thereof
    Patent number: 6673919
    Abstract: This invention relates to a chemically modified hyaluronic acid and salts thereof, which are obtained by O-acylating, alkoxylating or crosslinking a complex consisting of hyaluronic acid or a salt thereof and a cationic compound in a nonaqueous solvent, and a process for the production thereof. The nonaqueous solvent used in the invention is preferably one or more solvents selected from the group consisting of chloroform, toluene, methylene chloride and heptane.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: January 6, 2004
    Assignees: Chisso Cororation
    Inventors: Nobuhiko Yui, Tooru Ooya, Ikuo Sato