Granted Patent
Utility
US 5,592,938 · App. 08/288,005
Mask apparatus
Inventors:
Eugene N. Scarberry, Patrick M. Handke
Patented Case
View Patent ↗
Granted: Jan 14, 1997
Filed: Aug 9, 1994
Inventors
Eugene N. Scarberry
Patrick M. Handke
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.