Granted Patent
Utility
US 5,186,829 · App. 07/745,870
Fuel filter key system
Inventor:
Leon P. Janik
Patented Case
View Patent ↗
Granted: Feb 16, 1993
Filed: Aug 16, 1991
Inventor
Leon P. Janik
Assignee (at issue)
Stanadyne Automotive Corp.
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.