Granted Patent
Utility
US 6,289,891 · App. 09/435,026
Safety system and method for preventing mixing of different anaesthetics in an anaesthesia system
Inventor:
Göran Cewers
Patented Case
View Patent ↗
Granted: Sep 18, 2001
Filed: Nov 5, 1999
Inventor
Göran Cewers
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.