Security document voiding system
US6186404A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1998 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Jun 2, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63F2250/287
- WIPO fieldFurniture, games
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.