Granted Patent
Utility
US 5,155,437 · App. 07/557,973
Diagnostic device for gas turbine ignition system
Inventor:
John R. Frus
Patented Case
View Patent ↗
Granted: Oct 13, 1992
Filed: Jul 26, 1990
Inventor
John R. Frus
Assignee (at issue)
Unison Industries, 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.