Granted Patent
Utility
US 4,300,549 · App. 06/109,948
Operating room face mask
Inventor:
Duane A. Parker
Patented Case
View Patent ↗
Granted: Nov 17, 1981
Filed: Jan 7, 1980
Inventor
Duane A. Parker
Assignee (at issue)
Surgikos, 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.