Granted Patent
Utility
US 6,723,245 · App. 10/035,785
Method of using water soluble cationic polymers in membrane biological reactors
Inventors:
John H. Collins, Kristine S. Salmen
Patented Case
View Patent ↗
Granted: Apr 20, 2004
Filed: Jan 4, 2002
Inventors
John H. Collins
Kristine S. Salmen
Assignee (at issue)
Nalco Company LLC
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.