Granted Patent
Utility
US 5,322,664 · App. 08/012,498
Clear film extrusion from an annular die
Inventor:
Maurice W. Blackwelder
Patented Case
View Patent ↗
Granted: Jun 21, 1994
Filed: Feb 2, 1993
Inventor
Maurice W. Blackwelder
Assignee (at issue)
Owens-Illinois Labels 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.