Granted Patent
Utility
US 5,902,598 · App. 08/919,221
Sustained release drug delivery devices
Inventors:
Jianbing Chen, Paul Ashton
Patented Case
View Patent ↗
Granted: May 11, 1999
Filed: Aug 28, 1997
Inventors
Jianbing Chen
Paul Ashton
Assignee (at issue)
Control Delivery Systems, Inc.
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.