Granted Patent
Utility
US 5,874,522 · App. 08/962,873
Crosslinked polymeric ammonium salts
Inventors:
Garret D. Figuly, Jose R. Matos
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: Nov 3, 1997
Inventors
Garret D. Figuly
Jose R. Matos
Assignee (at issue)
Dupont Pharmaceuticals
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.