Method of rendering a document or portion of it resistant to photocopying
US5087507A · kind A · utility
57Cited by
1References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1988 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Nov 8, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24868
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An article with at least a portion carrying symbols representing information to be protected against photocopying is formed by a carrier, a continuous layer covering the portion of the carrier and forming a background thereon, and a mainly discontinuous layer applied on the continuous layer and forming the symbols against the background. One of the layers is an iridescent layer of a color that copies dark and the other of the layers has a dark color. Thus photocopying gives an image without distinction between the symbols and the background.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.