The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 31, 2017
Filed:
Mar. 24, 2015
Mettler-toledo Safeline Ltd., Greater Manchester, GB;
Stephen McAdam, Cheshire, GB;
Mettler-Toledo Safeline Ltd., Salford, Manchester, GB;
Abstract
A balanced coil system () of a metal detection system has a transmitter coil () connected to a first transmitter unit (), to provide a transmitter signal (s) comprising at least first and second operating frequencies (f, f). First and second receiver coils (), which compensate one another when the system is in balance, provide output signals (s, s) to a receiver unit (). The respective operating frequencies are applied separately together each with a monitoring frequency (f) to inputs of first and second modulation units (), which provide first and a second modulated monitoring signals (s, s), each comprising a first or second modulated monitoring frequency (f, f) without a carrier. When applied to a summation unit (), the modulated monitoring signals result in a combined output signal (s) that is applied to a monitoring coil (), inductively coupled with at least one of the receiver coils.