Portable currency detector

Details Portable currency detector Portable currency detector

1975-03-17

1976-08-24

Reeves, Robert B.

Classifying, separating, and assorting solids

Electrostatic

209DIG2, B07C 316

Patent

active

039761991

ABSTRACT:
A portable battery-powered device for verifying genuine currency based on the characteristic of United States and certain foreign currencies that some portion of the bill is printed with ink having magnetic properties. The device employs a tuned pickup head and correspondingly tuned narrow band regenerative amplifier using frequencies corresponding to those generated by sensing the engraving present along the longer edges of the currency when manually drawn past the pickup head.

REFERENCES:
patent: 3256984 (1966-06-01), Ptacek
patent: 3509535 (1970-04-01), Berube
patent: 3706027 (1972-12-01), Grice et al.
patent: 3715031 (1973-02-01), Okkonen

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