Granted Patent
Utility
US 5,137,017 · App. 07/669,468
Demand oxygen system
Inventor:
Peter W. Salter
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Mar 14, 1991
Inventor
Peter W. Salter
Assignee (at issue)
Salter Labs
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.