Granted Patent
Utility
US 6,691,552 · App. 10/408,922
Method and apparatus for monitoring the composition of a binary breathing gas mixture
Inventor:
Erik Cardelius
Patented Case
View Patent ↗
Granted: Feb 17, 2004
Filed: Apr 8, 2003
Inventor
Erik Cardelius
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.