Patents by Inventor Keith J. Douglas

Keith J. Douglas 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).

  • Patent number: 9225151
    Abstract: A spark plug, and associated systems, for an internal combustion engine includes a central electrode that terminates at a first distal end surface defined about a central axis. The spark plug also includes at least one outer electrode that terminates at a second distal end surface. The at least one outer electrode at least partially laterally surrounds the central electrode such that the second distal end surface is radially offset relative to the central electrode and a lateral gap is defined between the central electrode and the at least one outer electrode. The spark plug include features that force or redirect movement of the flow of the fresh air-fuel mixture through the lateral gap to help to purge or move the residual exhaust gases left over from a previous combustion event out of the lateral gap.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: December 29, 2015
    Assignee: CUMMINS IP, INC.
    Inventors: Keith J. Douglas, Xiao Qin, Daniel J. O'Connor, Premjee Sasidharan