Granted Patent
Utility
US 5,723,021 · App. 08/700,974
Method for inhibiting deposition in pulp and papermaking systems using a composition comprising of polyvinyl alcohol, gelatin and cationic polymer
Inventor:
Duy T. Nguyen
Patented Case
View Patent ↗
Granted: Mar 3, 1998
Filed: Aug 21, 1996
Inventor
Duy T. Nguyen
Assignee (at issue)
Betzdearborn, Inc.
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.