Sheet material comprising at least one watermark having a colored shade
US8852396B2 · kind B2 · utility
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29References
6Claims
0Family size
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Key dates
| Filing date | Apr 24, 2012 |
| Grant date | Oct 7, 2014 |
| Priority date | — |
| Expiry date | Apr 24, 2032 |
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 (2) 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 (6) 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.