Granted Patent
Utility
US 4,881,547 · App. 07/239,061
Angioplasty dilitation balloon catheter
Inventor:
John W. Danforth
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Sep 1, 1988
Inventor
John W. Danforth
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.