Granted Patent
Utility
US 5,247,826 · App. 07/975,616
Gas concentration and/or flow sensor
Inventors:
Frank R. Frola, Dennis A. Gibboney, Paul A. Bauer, Jr.
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Nov 12, 1992
Inventors
Frank R. Frola
Dennis A. Gibboney
Paul A. Bauer, Jr.
Assignee (at issue)
DEVILBISS HEALTHCARE LLC
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.