Near infrared fluorescent security thermal transfer printing and marking ribbons
US6174400A · kind A · utility
28Cited by
19References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1997 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Mar 4, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/914
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to thermal transfer ribbons comprising a ribbon backing element and at least one printing media layer comprising at least one near infrared fluorescent compound in a concentration which provides detectable fluorescence without imparting color to a mark made from said printing media layer. Methods for printing marks containing said at least one near infrared fluorescent compounds via thermal transfer and methods for reading said marks are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.