Granted Patent
Utility
US 5,115,804 · App. 07/226,624
Protective hood and oral-nasal mask
Inventor:
Michael Jeffrey Brookman
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Aug 1, 1988
Inventor
Michael Jeffrey Brookman
Assignee (at issue)
DME Company 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.