Patents by Inventor Jeffrey A. Leet

Jeffrey A. Leet 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).

  • Method for the simultaneous desulfation of a lean NOtrap and regeneration of a Diesel particulate filter
    Patent number: 7197867
    Abstract: High exhaust gas temperatures whereby sulfur is removed from a lean NOx traps simultaneously with regeneration of a Diesel particulate filter is provided by alternating engine operation in respectively defined lean and rich combustion modes. The duration and frequency of the respective lean and rich operating modes, as well as the air/fuel ratio during the respective modes, are preferably controlled by the sensed temperature of the lean NOx trap substrate.
    Type: Grant
    Filed: July 1, 2005
    Date of Patent: April 3, 2007
    Assignee: Southwest Research Institute
    Inventors: Yiqun Huang, Shizuo Sasaki, Gary D. Neely, Jeffrey A. Leet
  • Method for the simultaneous desulfation of a lean NOx trap and regeneration of a diesel particulate filter
    Publication number: 20060070373
    Abstract: High exhaust gas temperatures whereby sulfur is removed from a lean NOx traps simultaneously with regeneration of a Diesel particulate filter is provided by alternating engine operation in respectively defined lean and rich combustion modes. The duration and frequency of the respective lean and rich operating modes, as well as the air/fuel ratio during the respective modes, are preferably controlled by the sensed temperature of the lean NOx trap substrate.
    Type: Application
    Filed: July 1, 2005
    Publication date: April 6, 2006
    Inventors: Yiqun Huang, Shizuo Sasaki, Gary Neely, Jeffrey Leet
  • Method for controlling compression ignition combustion
    Patent number: 6378489
    Abstract: At least two separate fuels, having different volatility characteristics, are used to control the combustion phasing in a compression ignition engine. Desirably, the separate fuels are produced by distillation by which a parent fuel is separated into separate fractions having different reactivity. The provision multiple fuels by distillation and the control method embodying the present invention are particularly useful in controlling the combustion phasing of homogenous charge compression ignition combustion processes.
    Type: Grant
    Filed: May 24, 2001
    Date of Patent: April 30, 2002
    Inventors: Rudolf H. Stanglmaier, Charles E. Roberts, Jr., Daniel W. Dickey, Thomas W. Ryan, III, Jeffrey A. Leet, Lee G. Dodge, Matthew E. Schulman