Granted Patent
Utility
US 4,692,939 · App. 06/841,173
Switch testing
Inventor:
Donald Parsons
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: Mar 19, 1986
Inventor
Donald Parsons
Assignee (at issue)
Communications Test Design, 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.