Patents by Inventor Larry P. Chen

Larry P. Chen 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).

  • Urea manufacture
    Patent number: 3932504
    Abstract: Urea is made from ammonia and carbon dioxide by first reacting ammonia and carbon dioxide to form urea, ammonium carbamate and water, and then decomposing the carbamate to ammonia and carbon dioxide which are returned to the reaction zone.
    Type: Grant
    Filed: May 19, 1970
    Date of Patent: January 13, 1976
    Assignee: Vulcan-Cincinnati, Inc.
    Inventors: Larry P. Chen, Theodore O. Wentworth