Granted Patent
Utility
US 5,060,156 · App. 07/382,515
Method and apparatus for determining engine oil change intervals according to actual engine use
Inventors:
Jeffery L. Vajgart, Peter W. Misangyi, Parshuram G. Date, Roger S. Heitzeg, Noel A. Walker, David A. McNamara, Joe Attard
Patented Case
View Patent ↗
Granted: Oct 22, 1991
Filed: Jul 20, 1989
Inventors
Jeffery L. Vajgart
Peter W. Misangyi
Parshuram G. Date
Roger S. Heitzeg
Noel A. Walker
David A. McNamara
Joe Attard
Assignee (at issue)
Ford Motor Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.