Granted Patent
Utility
US 4,409,541 · App. 06/245,473
Method of and apparatus for determining continuity of an electrical conductor
Inventor:
RAYMOND RICHARDS
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Mar 19, 1981
Inventor
RAYMOND RICHARDS
Assignee (at issue)
PPG Industries, 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.