Granted Patent
Utility
US 6,228,397 · App. 09/139,449
Pharmaceutical composition having two coating layers
Inventors:
Robert Shen, Gerald A. Walter
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Aug 25, 1998
Inventors
Robert Shen
Gerald A. Walter
Assignee (at issue)
Pharmacia & Upjohn Company 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.