Granted Patent
Utility
US 5,318,669 · App. 07/929,554
Enhancement of paper dry strength by anionic and cationic polymer combination
Inventor:
Sunil P. Dasgupta
Patented Case
View Patent ↗
Granted: Jun 7, 1994
Filed: Aug 14, 1992
Inventor
Sunil P. Dasgupta
Assignee (at issue)
HERCULES 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.