Granted Patent
Utility
US 6,206,680 · App. 09/040,178
Extrusion die membrane
Inventor:
John A. Ulcej
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: Mar 17, 1998
Inventor
John A. Ulcej
Assignee (at issue)
Extrusion Dies, 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.