Granted Patent
Utility
US 4,348,346 · App. 06/171,391
Polyester film extrusion with edge bead control
Inventor:
Kenneth P. Thompson
Patented Case
View Patent ↗
Granted: Sep 7, 1982
Filed: Jul 23, 1980
Inventor
Kenneth P. Thompson
Assignee (at issue)
Champion International Corporation Limited
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.