Document protection methods and products
US5788285A · kind A · utility
92Cited by
20References
12Claims
0Family size
Inventor
Key dates
| Filing date | Jun 19, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Jun 19, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S285/902
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method and product for making non-reproducible documents, in which a nearly invisible indicia on the document is printed by continuous screened lines of a desired pitch, and a background that will not reproduce by copying that is formed by orthogonal reproduction of positive/negative images of continuous lines to produce broken lines of a desired width and pitch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.