Granted Patent
Utility
US 6,155,256 · App. 09/189,678
Fresh gas system and a method for vaporizing a liquid anaesthetic
Inventor:
Sten A. Wallin
Patented Case
View Patent ↗
Granted: Dec 5, 2000
Filed: Nov 13, 1998
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.