Granted Patent
Utility
US 5,357,950 · App. 08/025,111
Breath actuated positive pressure demand regulator with override
Inventors:
John Wippler, Max L. Kranz
Patented Case
View Patent ↗
Granted: Oct 25, 1994
Filed: Mar 2, 1993
Inventors
John Wippler
Max L. Kranz
Assignee (at issue)
Comasec International S.A.
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.