Granted Patent
Utility
US 6,138,813 · App. 09/324,673
Coin mechanism with a piezoelectric film sensor
Inventors:
Robert C. Lamb, William C. Wolffe, Robert Speers, John L. Tansky
Patented Case
View Patent ↗
Granted: Oct 31, 2000
Filed: Jun 3, 1999
Inventors
Robert C. Lamb
William C. Wolffe
Robert Speers
John L. Tansky
Assignee (at issue)
Mars, Incorporated
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.