Granted Patent
Utility
US 4,812,768 · App. 07/089,241
Digital engine analyzer
Inventor:
Robert O. Quinn
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Oct 9, 1987
Inventor
Robert O. Quinn
Assignee (at issue)
Snap-on Tools 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.