Granted Patent
Utility
US 4,600,426 · App. 06/656,293
Metering device for molten glass and the like
Inventor:
Ronald L. Schwenninger
Patented Case
View Patent ↗
Granted: Jul 15, 1986
Filed: Oct 1, 1984
Inventor
Ronald L. Schwenninger
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.