Granted Patent
Utility
US 4,264,668 · App. 06/050,201
Laminated material comprising an outer sealing layer of thermoplastic material
Inventor:
Gyula Balla
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: Jun 20, 1979
Inventor
Gyula Balla
Assignee (at issue)
Tetra Pak International AB
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.