Granted Patent
Utility
US 4,580,392 · App. 06/482,262
Method and an apparatus for the processing of a material web
Inventors:
Jan Lagerstedt, Esko Heinonen-Persson
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Apr 5, 1983
Inventors
Jan Lagerstedt
Esko Heinonen-Persson
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.