Granted Patent
Utility
US 4,648,641 · App. 06/672,481
Safety device
Inventor:
John K. Foster
Patented Case
View Patent ↗
Granted: Mar 10, 1987
Filed: Nov 16, 1984
Inventor
John K. Foster
Assignee (at issue)
Packaging Industries Group, 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.