Granted Patent
Utility
US 5,522,749 · App. 08/364,373
Positive oxygen mask release
Inventor:
John F. McNaughton
Patented Case
View Patent ↗
Granted: Jun 4, 1996
Filed: Dec 27, 1994
Inventor
John F. McNaughton
Assignee (at issue)
H. Koch & Sons Co., 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.