Granted Patent
Utility
US 5,151,654 · App. 07/215,642
Tachometer system for measuring the RPM of an internal combustion engine with no physical or visual connection
Inventors:
Stanley J. Krzywicki, Timothy S. Gibson, Joseph D. Orndorff
Patented Case
View Patent ↗
Granted: Sep 29, 1992
Filed: Jul 6, 1988
Inventors
Stanley J. Krzywicki
Timothy S. Gibson
Joseph D. Orndorff
Assignee (at issue)
Systems Control, Inc.
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.