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. 22, 2013
Filed:
Oct. 23, 2007
Applicants:
Gaston Baudat, Glenmoore, PA (US);
David Michael Furneaux, Reading, GB;
Inventors:
Gaston Baudat, Glenmoore, PA (US);
David Michael Furneaux, Reading, GB;
Assignee:
MEI, Inc., Malvern, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
G07F 9/08 (2006.01); G06F 7/00 (2006.01); G06F 9/00 (2006.01); G06F 19/00 (2011.01);
U.S. Cl.
CPC ...
Abstract
A coin sensor performs time-domain eddy-current testing using an inductance in one arm of a Maxwell bridge which is driven by a bipolar square wave having randomly-selected intervals between transitions, the output of the bridge being sampled at a high frequency. A processor stores a model which receives the drive signal and adjusts coefficients of the model so that the output matches the sampled measurements. Acceptance criteria are applied to the adjusted coefficients for coin classification purposes.