Granted Patent
Utility
US 4,398,994 · App. 06/302,370
Formation of packaging material
Inventor:
Donald E. Beckett
Patented Case
View Patent ↗
Granted: Aug 16, 1983
Filed: Sep 15, 1981
Inventor
Donald E. Beckett
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.