Granted Patent
Utility
US 4,187,559 · App. 05/914,738
Body joint endoprosthesis
Inventors:
Helmut Grell, Achim Engelhardt
Patented Case
View Patent ↗
Granted: Feb 12, 1980
Filed: Jun 12, 1978
Inventors
Helmut Grell
Achim Engelhardt
Assignee (at issue)
Sybron Corporation
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.