Patents by Inventor Nobuko Tsukazi

Nobuko Tsukazi 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 producing polyhydroxycarboxlic acid
    Patent number: 5883222
    Abstract: The present invention provides a process for producing polyhydroxycarboxylic acids having a weight-average molecular weight of 50,000 or above which are excellent as biodegradable plastics by subjecting Lactides to ring-opening polymerization in the presence of an inorganic solid acid catalyst carrying silica and/or a light metal.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: March 16, 1999
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Norio Yanagisawa, Toshikazu Murayama, Nobuko Tsukazi, Yorozu Yokomori