Granted Patent
Utility
US 4,681,797 · App. 06/777,797
Thermoformable, multi-layer plastic sheet having gas barrier properties
Inventor:
Augustinus E. M. Van Iseghem
Patented Case
View Patent ↗
Granted: Jul 21, 1987
Filed: Sep 19, 1985
Inventor
Augustinus E. M. Van Iseghem
Assignee (at issue)
Cobelplast N.V.S.A.
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.