Granted Patent
Utility
US 6,186,143 · App. 08/867,943
Apparatus for supplying atmospheric air and at least one additional gas to a respirating subject
Inventor:
Marcel Baum
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Jun 3, 1997
Inventor
Marcel Baum
Assignee (at issue)
Siemens Elema AB
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.