Patents Assigned to Waco Pure Chemical Ind. Inc.
  • Polymer and its production
    Patent number: 4683288
    Abstract: A polymer or copolymer of lactic acid and/or glycolic acid which has a weight-average molecular weight of not less than about 5,000 and a dispersity of about 1.5 to 2 is advantageously used as a biodegradable polymer or copolymer for medical preparation.
    Type: Grant
    Filed: July 3, 1985
    Date of Patent: July 28, 1987
    Assignees: Waco Pure Chemical Ind. Inc., Takeda Chemical Industries, Ltd.
    Inventors: Motoaki Tanaka, Yasuaki Ogawa, Tsutomu Miyagawa, Toshio Watanabe