Granted Patent
Utility
US 4,298,370 · App. 06/155,802
Method of improving glass melting by ablation enhancement
Inventor:
Joseph J. Hammel
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Jun 2, 1980
Inventor
Joseph J. Hammel
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.