Patents by Inventor Hsuan L. Tien

Hsuan L. Tien 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 preparing melamine
    Patent number: 4284771
    Abstract: There is provided a novel, economical process for preparing melamine from cyanogen and ammonia in the vapor phase and in the absence of dehydrogenation catalysts.
    Type: Grant
    Filed: September 8, 1980
    Date of Patent: August 18, 1981
    Assignee: American Cyanamid Company
    Inventors: Hsuan L. Tien, Kenneth E. Olson