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:
Apr. 29, 2003
Filed:
Apr. 02, 2001
Applicant:
Inventor:
David Michael Furneaux, Reading, GB;
Assignee:
Mars Incorporated, McLean, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N 2/700 ; G01N 2/772 ; H03B 5/08 ; H03B 5/12 ;
U.S. Cl.
CPC ...
G01N 2/700 ; G01N 2/772 ; H03B 5/08 ; H03B 5/12 ;
Abstract
A coin validator tests a coin using a pair of coils coupled in an oscillator circuit which is arranged to drive both the coils concurrently at two separate frequencies without interference therebetween, each frequency signal being influenced by the presence of a coin. Preferably, the coils are connected in series in a feedback loop to form a first oscillator, and the second oscillator is coupled to the interconnection between the coils the other ends of which are effectively short circuited at the frequency of the second oscillator.