Granted Patent
Utility
US 6,789,539 · App. 10/256,943
Dilution regulation method and device for breathing apparatus
Inventor:
Patrice Martinez
Patented Case
View Patent ↗
Granted: Sep 14, 2004
Filed: Sep 27, 2002
Inventor
Patrice Martinez
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.