Granted Patent
Utility
US 4,803,471 · App. 06/923,022
Ventilator monitor and alarm apparatus
Inventor:
Robert O. Rowland
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: Oct 24, 1986
Inventor
Robert O. Rowland
Assignee (at issue)
Hudson Oxygen Therapy Sales Company
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.