Thermochromic bar code
US6685094B2 · kind B2 · utility
124Cited by
16References
23Claims
0Family size
Inventor
Key dates
| Filing date | Dec 3, 1999 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Jul 8, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A bar code (10) incorporating thermochromic materials in selected modules (20) such that its code changes with temperature. Below a specified temperature, the bar code (10) displays a first code. Above this temperatures, the bar code (10) displays a second code. The bar code (10) is printed with conventional printing equipment onto conventional printing media, and is scanned with conventional bar code scanning equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.