Granted Patent
Utility
US 5,370,112 · App. 08/085,774
Method and means for powering portable oxygen supply systems
Inventor:
Warren E. Perkins
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: Jul 1, 1993
Inventor
Warren E. Perkins
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.