Granted Patent
Utility
US 4,819,839 · App. 06/708,824
Opening arrangement on packing containers
Inventors:
Lars Carlsson, Kjell Martensson, Hans-Georg Melle
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Mar 6, 1985
Inventors
Lars Carlsson
Kjell Martensson
Hans-Georg Melle
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.