Granted Patent
Utility
US 5,913,307 · App. 08/907,967
Breathing protection equipment with operating mode indication
Inventors:
Denis Taieb, Thierry Touratier, Michel Bardel
Patented Case
View Patent ↗
Granted: Jun 22, 1999
Filed: Aug 11, 1997
Inventors
Denis Taieb
Thierry Touratier
Michel Bardel
Assignee (at issue)
Intertechnique
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.