Granted Patent
Utility
US 5,840,341 · App. 08/809,158
Drug delivery composition containing chitosan or derivative thereof having a defined z. potential
Inventors:
Peter Watts, Lisbeth Illum
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Apr 21, 1997
Inventors
Peter Watts
Lisbeth Illum
Assignee (at issue)
Danbiosyst UK Limited
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.