Granted Patent
Utility
US 6,220,242 · App. 09/261,185
Dosing device suitable for regulating a vapor concentration in an anesthesia/ventilator apparatus
Inventor:
Sten A. Wallin
Patented Case
View Patent ↗
Granted: Apr 24, 2001
Filed: Mar 3, 1999
Inventor
Sten A. Wallin
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.