Security paper having camouflage materials to protect its authenticity features
US4463970A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1981 |
| Grant date | Aug 7, 1984 |
| Priority date | — |
| Expiry date | Dec 1, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/919
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A data carrier having excitable marking materials to record information in code and further materials to camouflage them, as well as a method of producing this type of data carrier. The coded information is given in the form of the local presence or absence of the excitable marking materials, and is read by detecting the state of excitation, which can only be done with difficulty. The camouflage materials have the function of preventing the detection of the marking material pattern indirectly by means of a chemical laboratory analysis; this camouflage is successful when materials are used which are very similar chemically to the marking materials, and in particular yield the same results as these in a chemical laboratory analysis, but are not excitable with the same means or in the same manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.