Granted Patent
Utility
US 5,186,793 · App. 07/636,487
Oxygen concentrator utilizing electrochemical cell
Inventor:
Gregory A. Michaels
Patented Case
View Patent ↗
Granted: Feb 16, 1993
Filed: Dec 31, 1990
Inventor
Gregory A. Michaels
Assignee (at issue)
INVACARE CORPORATION
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.