Granted Patent
Utility
US 6,238,521 · App. 09/316,372
Use of diallyldimethylammonium chloride acrylamide dispersion copolymer in a papermaking process
Inventors:
Jane B. Wong Shing, Chidambaram Maltesh, Ramasubramanyam Nagarajan
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: May 21, 1999
Inventors
Jane B. Wong Shing
Chidambaram Maltesh
Ramasubramanyam Nagarajan
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.