Granted Patent
Utility
US 6,718,982 · App. 09/850,334
Face mask incorporating respiratory flow sensor
Inventors:
Mark A. Smith, Rex T. Fasching, C. Peter Howard
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: May 7, 2001
Inventors
Mark A. Smith
Rex T. Fasching
C. Peter Howard
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.