Composite authentication mark and system and method for reading the same
US6354501B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1999 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | May 14, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06028
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A composite authentication mark includes a bar code portion that is visible when illuminated with visible light and an invisible code portion that is not visible when illuminated with visible light, wherein the bar code portion includes a plurality of bars and spaces and the invisible code portion is arranged in at least one of the spaces of the bar code portion without overlapping any of the bars of the bar code portion. Because the invisible code portion does not overlap with any of the bars of the bar code portion, a single-step printing and reading processes may be used. More information can be coded by the composite authentication mark by using the relative location of the invisible code portion within the spaces of the bar code portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.