Granted Patent
Utility
US 4,298,374 · App. 06/159,528
Apparatus for improving glass melting by perforating batch layer
Inventors:
Edward P. Savolskis, Walter Scott
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Jun 16, 1980
Inventors
Edward P. Savolskis
Walter Scott
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.