Granted Patent
Utility
US 4,536,205 · App. 06/633,559
Method for controlling currents in glass melter
Inventors:
John F. Krumwiede, William C. Harrell, William G. Hilliard, James E. Harris
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Jul 23, 1984
Inventors
John F. Krumwiede
William C. Harrell
William G. Hilliard
James E. Harris
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.