Granted Patent
Utility
US 5,795,481 · App. 08/593,715
Process for the treatment of aqueous effluents on biofilters or other devices making use of fixed cultures
Inventor:
Andre Lesouef
Patented Case
View Patent ↗
Granted: Aug 18, 1998
Filed: Jan 29, 1996
Inventor
Andre Lesouef
Assignee (at issue)
OTV Omnium de Traltements et de Valorisation S.A.
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.