Granted Patent
Utility
US 6,280,631 · App. 08/364,589
Use of polymers containing vinylamine/vinylformamide for the treatment of food processing wastewater
Inventors:
Anthony G. Sommese, Daniel K. Chung
Patented Case
View Patent ↗
Granted: Aug 28, 2001
Filed: Dec 27, 1994
Inventors
Anthony G. Sommese
Daniel K. Chung
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.