Method for applying chemical watermarks on substrate
US6334678B1 · kind B1 · utility
10Cited by
28References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1999 |
| Grant date | Jan 1, 2002 |
| Priority date | — |
| Expiry date | Sep 1, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/01
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method and an apparatus for applying chemical watermarks to a substrate, e.g., paper, using a digital printer which prints ink in a dot matrix pattern. The ink may contain either a translucentizing agent or an opacifying agent. The printer is digitally controlled to print ink in accordance with a computer program corresponding to a desired pattern or image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.