Granted Patent
Utility
US 5,043,659 · App. 07/452,185
Non-intrusive tachometer for spark ignition autos
Inventors:
Donald Allan Lowmiller, James D. Fraser, Neil W. Kunst
Patented Case
View Patent ↗
Granted: Aug 27, 1991
Filed: Dec 18, 1989
Inventors
Donald Allan Lowmiller
James D. Fraser
Neil W. Kunst
Assignee (at issue)
Clean Air Technologies, LLC
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.