Patents by Inventor Masako Yoshikawa

Masako Yoshikawa 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).

  • Aspartic acid copolymer and process for producing the same
    Patent number: 5854378
    Abstract: This invention an aspartic acid copolymer obtained by copolymerizing a monomer mixture comprising (1) aspartic acid, maleamic acid and/or a reaction product of maleic acid and ammonia as a main monomer, (2) fumaric acid, and (3) succinic acid and containing 0.005 to 3% by weight, based on the total monomers, of ammonia in the form of an ammonium salt and hydrolyzing the resulting copolymer partially or completely; and a process for producing the same.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: December 29, 1998
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Masayuki Tomida, Masako Yoshikawa, Takeshi Nakato