Granted Patent
Utility
US 4,894,513 · App. 07/215,147
Heatable windshield temperature control
Inventor:
Harry S. Koontz
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Jul 5, 1988
Inventor
Harry 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.