Granted Patent
Utility
US 5,403,668 · App. 08/181,071
Method of manufacturing biaxially oriented heat-shrinkable film
Inventor:
Darrel L. Wilhoit
Patented Case
View Patent ↗
Granted: Apr 4, 1995
Filed: Jan 14, 1994
Inventor
Darrel L. Wilhoit
Assignee (at issue)
Viskase Companies, 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.