Patent · US Active

Method for testing coins

US7708130B2 · kind B2 · utility

5Cited by

5References

10Claims

0Family size

Assignee

National Rejectors, Inc. GmbH · US

Inventors

Wilfried Meyer · Buxtehude, DE
Ulrich Cohrs · Horneburg, DE
Claus Peter Heins · Horneburg, DE

Key dates

Filing date	Sep 15, 2008
Grant date	May 4, 2010
Priority date	—
Expiry date	Sep 15, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG07D5/08
WIPO fieldControl
WIPO sectorInstruments

Abstract

A method for testing coins which move along a runway, using a coil assembly which, on either side of the runway, has a transmission coil C, D adapted to be admitted by a transmission signal and a reception coil A, B on a common ferrite core wherein the reception coil smaller in diameter is closer to the runway than is the transmission coil and the diameter of the transmission coil is smaller than the diameter of the smallest coin to be assumed, and wherein the ferrite core has arranged thereon a secondary coil coupled to the transmission coil the signal of which is connected, as a negative-feedback signal, to the input of a differential amplifier in such a way that the signal of the transmission coil agrees with the transmitted signal provided to the other input of the differential amplifier.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.