Patents by Inventor Keith A. Long

Keith A. Long 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).

  • Propane injection system and method for a diesel engine
    Patent number: 6422015
    Abstract: A method and system for reliably and cost effectively operating a turbocharged diesel engine by injecting propane in gaseous form from a vehicle mounted tank into the engine by the use of a fuel pressure regulator valve responsive to the boost pressure of the engine turbocharger to adjust fuel flow correspondingly. A safety switching arrangement requires manual reactivation of the system each time the engine is restarted.
    Type: Grant
    Filed: January 23, 2001
    Date of Patent: July 23, 2002
    Inventor: Keith A. Long
  • Propane injection system and method for a diesel engine
    Publication number: 20020014077
    Abstract: A method and system for reliably and cost effectively operating a turbocharged diesel engine by injecting propane in gaseous form from a vehicle mounted tank into the engine by the use of a fuel pressure regulator valve responsive to the boost pressure of the engine turbocharger to adjust fuel flow correspondingly. A safety switching arrangement requires manual reactivation of the system each time the engine is restarted.
    Type: Application
    Filed: January 23, 2001
    Publication date: February 7, 2002
    Inventor: Keith A. Long