Granted Patent
Utility
US 5,209,980 · App. 07/633,894
Transparent counterelectrodes
Inventor:
Ralph Spindler
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Dec 26, 1990
Inventor
Ralph Spindler
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.