Sheet material comprising at least one watermark having a colored shade
US8182651B2 · kind B2 · utility
2Cited by
14References
18Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Feb 9, 2007 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Sep 11, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24942
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a sheet material comprising at least one first layer defining an outer surface of the sheet material and having at least one first color, at least one second layer comprising at least one watermark and having at least one second color, the first and second colors having at least different saturations and/or hue angles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.