Granted Patent
Utility
US 5,169,587 · App. 07/715,465
Process for extruding large oriented polymer shapes
Inventor:
Gregory J. Courval
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Jun 14, 1991
Inventor
Gregory J. Courval
Assignee (at issue)
Symplastics 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.