Granted Patent
Utility
US 5,989,581 · App. 09/056,700
Drug delivery system for two or more active substances
Inventor:
Rudolf Johannes Joseph Groenewegen
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Apr 8, 1998
Inventor
Rudolf Johannes Joseph Groenewegen
Assignee (at issue)
AKZO NOBEL N.V.
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.