Granted Patent
Utility
US 4,591,371 · App. 06/772,976
Glass fiber forming bushing construction
Inventor:
William L. Schaefer
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Sep 5, 1985
Inventor
William L. Schaefer
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.