Granted Patent
Utility
US 4,520,925 · App. 06/521,723
Package
Inventor:
Douglas M. Johnson
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Aug 9, 1983
Inventor
Douglas M. Johnson
Assignee (at issue)
Empak, Inc.
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.