Granted Patent
Utility
US 4,585,498 · App. 06/680,819
Method for sealing an emptying opening and an arrangement for the realization of the method
Inventors:
Jan Lagerstedt, Bengt-Arne Arnspang
Patented Case
View Patent ↗
Granted: Apr 29, 1986
Filed: Dec 12, 1984
Inventors
Jan Lagerstedt
Bengt-Arne Arnspang
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.