Granted Patent
Utility
US 4,328,823 · App. 06/149,874
Oxygen flow ratio controller for anesthesia apparatus
Inventor:
Peter Schreiber
Patented Case
View Patent ↗
Granted: May 11, 1982
Filed: May 14, 1980
Inventor
Peter Schreiber
Assignee (at issue)
NAD AG
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.