Granted Patent
Utility
US 5,006,144 · App. 07/543,006
Melting glass with oxidation control and lowered emissions
Inventors:
Leonard A. Knavish, William C. Harrell
Patented Case
View Patent ↗
Granted: Apr 9, 1991
Filed: Jun 25, 1990
Inventors
Leonard A. Knavish
William C. Harrell
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.