Granted Patent
Utility
US 5,304,121 · App. 07/795,976
Drug delivery system making use of a hydrogel polymer coating
Inventor:
Ronald A. Sahatjian
Patented Case
View Patent ↗
Granted: Apr 19, 1994
Filed: Nov 22, 1991
Inventor
Ronald A. Sahatjian
Assignee (at issue)
Boston Scientific 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.