Granted Patent
Utility
US 5,019,078 · App. 07/437,581
Bone screw
Inventors:
Stephen Perren, Robert Frigg, Paul Gisin, Robert Mathys
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Nov 17, 1989
Inventors
Stephen Perren
Robert Frigg
Paul Gisin
Robert Mathys
Assignee (at issue)
Synthes USA, LLC
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.