Granted Patent
Utility
US 4,227,640 · App. 06/036,742
Self locking tray and blank for forming same
Inventor:
Harry I. Roccaforte
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: May 7, 1979
Inventor
Harry I. Roccaforte
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.