Granted Patent
Utility
US 4,553,271 · App. 06/367,533
Artificial sphincter apparatus and method
Inventor:
Charles D. Baker
Patented Case
View Patent ↗
Granted: Nov 19, 1985
Filed: Apr 12, 1982
Inventor
Charles D. Baker
Assignee (at issue)
University of Utah Research Institute
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.