Patents by Inventor John E. Holfmann

John E. Holfmann 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 the in-line hydrolysis of urea
    Patent number: 5240688
    Abstract: The present invention relates to a process for the in-line hydrolysis of urea. More particularly, the process involves heating an aqueous solution of urea while flowing through a conduit to a temperature and for a time effective to hydrolyze urea to produce hydrolysis products comprising ammonium carbamate, ammonium carbonate, ammonium bicarbonate, and ammonia. The hydrolysis products are useful for the reduction of nitrogen oxides in combustion effluents without the generation of substantial amounts of nitrous oxide.
    Type: Grant
    Filed: August 1, 1990
    Date of Patent: August 31, 1993
    Assignee: Fuel Tech GmbH
    Inventors: Thure von Harpe, Reihard Pachaly, John E. Holfmann