Granted Patent
Utility
US 4,936,855 · App. 07/342,316
Stepped-lock ring system for implantable joint prostheses
Inventor:
Randy G. Sherman
Patented Case
View Patent ↗
Granted: Jun 26, 1990
Filed: Apr 24, 1989
Inventor
Randy G. Sherman
Assignee (at issue)
Intermedics Orthopedics, 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.