Granted Patent
Utility
US 4,991,633 · App. 07/473,072
Sanitary packaging system
Inventor:
David M. Wong
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Jan 31, 1990
Inventor
David M. Wong
Assignee (at issue)
MALLINCKRODT LLC
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.