Granted Patent
Utility
US 4,902,875 · App. 07/267,402
Power discontinuity sensor for a dual feed heatable windshield
Inventor:
Harold S. Koontz
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Nov 4, 1988
Inventor
Harold S. Koontz
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.