Granted Patent
Utility
US 4,971,049 · App. 07/432,067
Pressure sensor control device for supplying oxygen
Inventors:
William J. Rotariu, Darold Wobschall
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Nov 6, 1989
Inventors
William J. Rotariu
Darold Wobschall
Assignee (at issue)
Pulsair, Inc.
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.