Control element for printed matters
US6997482B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 2002 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Jul 9, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24802
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The control element has a first drawing printed on a first side of the article, comprising at least a first set of geometrical shapes. It includes a second drawing printed on a second side of said article, the second drawing being printed so as to face the first drawing and be in register with the latter, said second drawing comprising at least a second set of geometrical shapes corresponding to the first screen. At least one of said geometrical sets includes sectors which are offset so that, when the front side/reverse side register is correct, the control element has regions of variable density which are visible in transmitted light and are created by said offset sectors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.