Granted Patent
Utility
US 4,261,939 · App. 06/064,769
Method and an arrangement for the manufacture of a material web of foamed thermoplastics
Inventors:
Lennart Nilsson, Sven Andren, Per Ljungberg
Patented Case
View Patent ↗
Granted: Apr 14, 1981
Filed: Aug 8, 1979
Inventors
Lennart Nilsson
Sven Andren
Per Ljungberg
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.