Patents by Inventor Graham Paul Ansell

Graham Paul Ansell 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).

  • Diesel engine exhaust gas purification method
    Patent number: 5943857
    Abstract: A process for the improved conversion of NO.sub.x in the exhaust gases from a light diesel engine using lean NO.sub.x catalyst converter in the exhaust system. The process is characterized in that unburned hydrocarbons are adsorbed into an adsorbent in the catalytic converter at temperatures below 190.degree. C. during cooler parts of the operating cycle, and are desorbed in the temperature range of 198.degree. to 200.degree. C. during hotter parts of the operating cycle. The desorbed hydrocarbons are combined with unburned hydrocarbons in the exhaust to form a composition stream having a higher amount of hydrocarbons than either constituent stream which are then oxidized at the same time as at least a portion of the NO.sub.x is catalytically reduced to form N.sub.2.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: August 31, 1999
    Assignee: Johnson Matthey Public Limited Company
    Inventors: Graham Paul Ansell, Janet Mary Fisher, Peter Geoffrey Gray, Hugh Gavin Charles Hamilton, Raj Rao Rajaram