Granted Patent
Utility
US 5,119,916 · App. 07/499,719
Sensor for measuring the magnetically responsive characteristics of tokens
Inventors:
Ralph H. Carmen, John W. Van Horn
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Mar 27, 1990
Inventors
Ralph H. Carmen
John W. Van Horn
Assignee (at issue)
Duncan Industries Parking Control Corp.
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.