Granted Patent
Utility
US 4,437,570 · App. 06/398,678
Shipping carton with case knife protection for inner cartons
Inventor:
John F. Sorenson
Patented Case
View Patent ↗
Granted: Mar 20, 1984
Filed: Jul 15, 1982
Inventor
John F. Sorenson
Assignee (at issue)
Champion International Corporation Limited
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.