Granted Patent
Utility
US 6,228,396 · App. 08/765,347
Colonic drug delivery composition
Inventor:
Peter Watts
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Feb 10, 1997
Inventor
Peter Watts
Assignee (at issue)
West Pharmaceutical Services Drug Delivery & Clinical Research Centre Ltd.
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.