Patents by Inventor Paul J. Tennison

Paul J. Tennison 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).

  • Exhaust gas aftertreatment systems
    Patent number: 6892530
    Abstract: A method for improving NOx conversion efficiency of a urea base SCR catalyst is presented. Since efficiency is reduced by the presence of hydrocarbons in the catalyst, the method proposes to regenerate the SCR by maintaining its temperature above the boiling point of hydrocarbons for a sufficient period of time to free up catalyst storage sites. The regeneration process is followed by over-injection of ammonia to replenish the ammonia released from the SCR catalyst due to high regeneration temperatures.
    Type: Grant
    Filed: November 21, 2002
    Date of Patent: May 17, 2005
    Assignee: Ford Global Technologies, LLC
    Inventors: Clifford Norman Montreuil, Michiel J. van Nieuwstadt, Paul J. Tennison
  • Exhaust gas aftertreatment systems
    Publication number: 20040098980
    Abstract: A method for improving NOx conversion efficiency of a urea base SCR catalyst is presented. Since efficiency is reduced by the presence of hydrocarbons in the catalyst, the method proposes to regenerate the SCR by maintaining its temperature above the boiling point of hydrocarbons for a sufficient period of time to free up catalyst storage sites. The regeneration process is followed by over-injection of ammonia to replenish the ammonia released from the SCR catalyst due to high regeneration temperatures.
    Type: Application
    Filed: November 21, 2002
    Publication date: May 27, 2004
    Inventors: Clifford Norman Montreuil, Michiel J. van Nieuwstadt, Paul J. Tennison