Granted Patent
Utility
US 4,570,844 · App. 06/658,404
Paperboard frame with lockable corners
Inventor:
Lawrence S. Wysocki
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Oct 5, 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.