Granted Patent
Utility
US 4,927,543 · App. 07/310,204
Method and installation for treating liquid by sedimentation using fine sand
Inventors:
Guy P. Bablon, Gilbert Desbos
Patented Case
View Patent ↗
Granted: May 22, 1990
Filed: Feb 14, 1989
Inventors
Guy P. Bablon
Gilbert Desbos
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.