Granted Patent
Utility
US 4,561,587 · App. 06/674,875
Frame made from paperboard and having lockable corners
Inventor:
Lawrence S. Wysocki
Patented Case
View Patent ↗
Granted: Dec 31, 1985
Filed: Nov 26, 1984
Inventor
Lawrence S. Wysocki
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.