Granted Patent
Utility
US 4,655,387 · App. 06/808,366
Packing container provided with a sine curve tear-up opening arrangement
Inventor:
Nils O. Magnusson
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Dec 13, 1985
Inventor
Nils O. Magnusson
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.