Granted Patent
Utility
US 4,878,889 · App. 07/211,346
Artificial sphincter device
Inventor:
Mark Polyak
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: Jun 24, 1988
Inventor
Mark Polyak
Assignee (at issue)
American Medical Systems, 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.