Granted Patent
Utility
US 5,273,151 · App. 07/855,252
Resonant coil coin detection apparatus
Inventors:
Ralph H. Carmen, James M. Rodgers
Patented Case
View Patent ↗
Granted: Dec 28, 1993
Filed: Mar 23, 1992
Inventors
Ralph H. Carmen
James M. Rodgers
Assignee (at issue)
Duncan Industries Parking Control Systems
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.