Patents by Inventor Hung-Chung Hsia

Hung-Chung Hsia 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).

  • Cryogenic adhesives made from epoxy terminated urethanes
    Patent number: 5484853
    Abstract: A two-part adhesive composition having superior adhesive strength at cryogenic temperatures contains a urethane resin composition part and a hardener part. The urethane resin composition part comprises 50 to 99% by weight of a modified polyurethane prepolymer having an epoxy group at each of its respective ends and 1 to 50% by weight of a modified urethane compound having substantially no ether cyanate (NCO) groups and at least two epoxy groups per molecule and a molecular weight of less than 800 daltons. The hardener part is a polyamine containing primary or secondary amine groups. The equivalent ratio of the amine groups of the polyamine to the epoxy groups of the urethane resin composition part is 0.5 to 2.0.
    Type: Grant
    Filed: July 28, 1993
    Date of Patent: January 16, 1996
    Assignee: China Technical Consultants, Inc.
    Inventors: Der-Shyang Chen, Hung-Chung Hsia, Chen-Chi M. Ma, Wang-Nang Wang