Granted Patent
Utility
US 5,018,519 · App. 07/562,242
Mask for adminstering an anesthetic gas to a patient
Inventor:
Glenn E. Brown
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Aug 3, 1990
Inventor
Glenn E. Brown
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.