Granted Patent
Utility
US 5,393,593 · App. 08/133,949
Dark gray, infrared absorbing glass composition and coated glass for privacy glazing
Inventors:
Joseph A. Gulotta, John F. Krumwiede, Luke A. Kutilek, Anthony V. Longobardo, Robert B. Heithoff
Patented Case
View Patent ↗
Granted: Feb 28, 1995
Filed: Oct 12, 1993
Inventors
Joseph A. Gulotta
John F. Krumwiede
Luke A. Kutilek
Anthony V. Longobardo
Robert B. Heithoff
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.