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:
Feb. 13, 2001
Filed:
Jun. 02, 1998
Michael A. Ehrhart, Liverpool, NY (US);
Robert M. Hussey, Camillus, NY (US);
Todd A. Dueker, Camillus, NY (US);
Cayetano Sanchez, III, East Greenwich, RI (US);
Walter Szrek, East Greenwich, RI (US);
John C. Abraitis, Cumberland, RI (US);
Claude Lambert, Montreal, CA;
Francois Gougeon, Montreal, CA;
Robert Boulay, Laval, CA;
Denis Mondou, Chateaugay, CA;
Welch Allyn Data Collection, Inc., Skaneateles Falls, NY (US);
Abstract
The present invention is a system for voiding a security document. The system voids a security document by supplying heat to a localized area of a specially configured security document. According to the invention, conductive material is formed on a document so that at least one relatively higher resistance section is formed on the document. When a voltage is supplied to the document, a relatively high amount of heat is supplied to the document about the area of the relatively higher resistance section. Heat-sensitive material may be formed about the location of the relatively higher resistance section such that the heat sensitive material becomes visible or changes color when a voltage is supplied to the document.