Granted Patent
Utility
US 6,346,139 · App. 09/560,754
Total delivery oxygen concentration system
Inventor:
Michael P. Czabala
Patented Case
View Patent ↗
Granted: Feb 12, 2002
Filed: Apr 28, 2000
Inventor
Michael P. Czabala
Assignee (at issue)
Respironics, 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.