Patents by Inventor Dennis A. Ruffer

Dennis A. Ruffer 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).

  • Matrix method and apparatus for engine analysis
    Patent number: 4373186
    Abstract: A results based "AND" matrix method and means for the diagnostic analysis of an internal combustion engine is described. A diagnostic evaluation of the operating condition of an internal combustion engine is achieved, based solely on AND function relationships with respect to currently measured engine parameter values and a diagnostic equation, without the need for making, collecting and correlating a plurality of separate evaluative judgments regarding engine operating parameters.
    Type: Grant
    Filed: August 14, 1980
    Date of Patent: February 8, 1983
    Assignee: Allen Group Inc.
    Inventors: John P. Marshall, Dennis A. Ruffer