Granted Patent
Utility
US 5,501,770 · App. 08/289,451
Enzymes in combination with polyelectrolytes for enhancing the freeness of clarified sludge in papermaking
Inventors:
Jawed M. Sarkar, Hanuman P. Didwania
Patented Case
View Patent ↗
Granted: Mar 26, 1996
Filed: Aug 12, 1994
Inventors
Jawed M. Sarkar
Hanuman P. Didwania
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.