Granted Patent
Utility
US 4,947,864 · App. 07/482,907
Guidewire exchange catheter
Inventors:
Rick L. Shockey, Mark A. Rydell
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: Feb 22, 1990
Inventors
Rick L. Shockey
Mark A. Rydell
Assignee (at issue)
Schneider (U.S.A.), Inc. A Pfizer Company
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.