Granted Patent
Utility
US 6,745,771 · App. 10/013,246
Anesthetic filter arrangement with variable retention of gas by the filter
Inventors:
Rolf Castor, Petter Videbrink
Patented Case
View Patent ↗
Granted: Jun 8, 2004
Filed: Dec 10, 2001
Inventors
Rolf Castor
Petter Videbrink
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.