Granted Patent
Utility
US 5,191,957 · App. 07/722,480
Coin discrimination method
Inventor:
Stephen J. Hayes
Patented Case
View Patent ↗
Granted: Mar 9, 1993
Filed: Jun 28, 1991
Inventor
Stephen J. Hayes
Assignee (at issue)
Protel, 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.