Patents by Inventor Roger S. Heitzeg

Roger S. Heitzeg 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 and apparatus for determining engine oil change intervals according to actual engine use
    Patent number: 5060156
    Abstract: Engine lubricating oil temperature and the amount of engine usage are used to calculate when engine lubricating oil has reached the end of its predicted wear life. Each spark (engine speed) pulse is multiplied by weighting factors that are periodically determined by sampling the engine oil temperature and the length of time the engine has been in continuous use above a predetermined speed. When the value of the accumulated weighted spark pulses has reached a predetermined level, a warning signal is provided to indicate the necessity of changing the engine lubricating oil.
    Type: Grant
    Filed: July 20, 1989
    Date of Patent: October 22, 1991
    Assignee: Ford Motor Company
    Inventors: Jeffery L. Vajgart, Peter W. Misangyi, Parshuram G. Date, Roger S. Heitzeg, Noel A. Walker, David A. McNamara, Joe C. Attard