Granted Patent
Utility
US 6,007,721 · App. 09/098,100
Method and system for regulating the addition of oxygenated gas into a biofilter with rising currents
Inventors:
Michele Payraudeau, Arnaud Gisclon
Patented Case
View Patent ↗
Granted: Dec 28, 1999
Filed: Jun 16, 1998
Inventors
Michele Payraudeau
Arnaud Gisclon
Assignee (at issue)
Omnium de Traitement et de Valorisation
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.