Granted Patent
Utility
US 4,950,228 · App. 07/463,297
Ureteral stent
Inventors:
Peter M. Knapp, Jr., Daniel M. Newman
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Jan 10, 1990
Inventors
Peter M. Knapp, Jr.
Daniel M. Newman
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.