Patents by Inventor Neal W. Wallace

Neal W. Wallace 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 system with a selective catalytic reduction catalyst member upstream of a particulate filter
    Patent number: 11421572
    Abstract: An exhaust gas aftertreatment system for an internal combustion engine includes an inlet conduit, a reductant decomposition chamber, a first selective catalytic reduction (SCR) catalyst member, a second SCR catalyst member, a mixing chamber, a particulate filter, a reductant delivery system, and a hydrocarbon delivery system. The inlet conduit is configured to receive exhaust gas from the internal combustion engine. The reductant decomposition chamber is fluidly coupled to the inlet conduit and configured to receive the exhaust gas from the inlet conduit. The first SCR catalyst member is fluidly coupled to the reductant decomposition chamber and configured to receive the exhaust gas from the reductant decomposition chamber. The second SCR catalyst member is fluidly coupled to the first SCR catalyst member and is configured to receive the exhaust gas from the first SCR catalyst member.
    Type: Grant
    Filed: December 21, 2020
    Date of Patent: August 23, 2022
    Assignee: Cummins Inc.
    Inventors: Rohan A. Siddhanthi, Neal W. Wallace, Michael Haas, Michael J. Ruth, Krishna Pradeep Chilumukuru, Shirish S. Punde
  • EXHAUST GAS AFTERTREATMENT SYSTEM WITH A SELECTIVE CATALYTIC REDUCTION CATALYST MEMBER UPSTREAM OF A PARTICULATE FILTER
    Publication number: 20210215079
    Abstract: An exhaust gas aftertreatment system for an internal combustion engine includes an inlet conduit, a reductant decomposition chamber, a first selective catalytic reduction (SCR) catalyst member, a second SCR catalyst member, a mixing chamber, a particulate filter, a reductant delivery system, and a hydrocarbon delivery system. The inlet conduit is configured to receive exhaust gas from the internal combustion engine. The reductant decomposition chamber is fluidly coupled to the inlet conduit and configured to receive the exhaust gas from the inlet conduit. The first SCR catalyst member is fluidly coupled to the reductant decomposition chamber and configured to receive the exhaust gas from the reductant decomposition chamber. The second SCR catalyst member is fluidly coupled to the first SCR catalyst member and is configured to receive the exhaust gas from the first SCR catalyst member.
    Type: Application
    Filed: December 21, 2020
    Publication date: July 15, 2021
    Applicant: Cummins Inc.
    Inventors: Rohan A. Siddhanthi, Neal W. Wallace, Michael Haas, Michael J. Ruth, Krishna Pradeep Chilumukuru, Shirish S. Punde