Granted Patent
Utility
US 4,944,756 · App. 07/151,747
Prosthetic knee joint with improved patellar component tracking
Inventor:
Robert V. Kenna
Patented Case
View Patent ↗
Granted: Jul 31, 1990
Filed: Feb 3, 1988
Inventor
Robert V. Kenna
Assignee (at issue)
Pfizer Hospital Products Group, Inc.
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.