Granted Patent
Utility
US 5,690,961 · App. 08/362,689
Acidic polysaccharides crosslinked with polycarboxylic acids and their uses
Inventor:
Tuyen T. Nguyen
Patented Case
View Patent ↗
Granted: Nov 25, 1997
Filed: Dec 22, 1994
Inventor
Tuyen T. Nguyen
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.