Granted Patent
Utility
US 5,332,506 · App. 08/165,690
Water clarification
Inventors:
Robert A. Marble, Timothy L. Sweeney
Patented Case
View Patent ↗
Granted: Jul 26, 1994
Filed: Dec 13, 1993
Inventors
Robert A. Marble
Timothy L. Sweeney
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.