Granted Patent
Utility
US 5,320,644 · App. 07/922,711
Intervertebral disk prosthesis
Inventor:
Walter Baumgartner
Patented Case
View Patent ↗
Granted: Jun 14, 1994
Filed: Jul 30, 1992
Inventor
Walter Baumgartner
Assignee (at issue)
Sulzer Brothers Limited
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.