Granted Patent
Utility
US 5,433,863 · App. 08/153,649
Method for clarifying wastewater containing surfactants
Inventors:
Michael L. Braden, Robert A. Marble
Patented Case
View Patent ↗
Granted: Jul 18, 1995
Filed: Nov 17, 1993
Inventors
Michael L. Braden
Robert A. Marble
Assignee (at issue)
Nalco Chemical Company
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.