Granted Patent
Utility
US 5,536,261 · App. 08/299,759
Method and closed tip effect catheter apparatus for use in angiography
Inventor:
Robert C. Stevens
Patented Case
View Patent ↗
Granted: Jul 16, 1996
Filed: Sep 1, 1994
Inventor
Robert C. Stevens
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.