Color tracing paper
US6630056B1 · kind B1 · utility
11Cited by
3References
21Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 13, 1999 |
| Grant date | Oct 7, 2003 |
| Priority date | — |
| Expiry date | Dec 13, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/919
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An intensely colored transparent and/or translucent paper has chroma c and brightness L, as measured by a Hunterlab instrument, which measures the Cartesian coordinates a, b, L of a point P of color and its polar coordinates H and c. The paper is such that the ratio of c to L is higher than 30%, preferably higher than 50%. The paper contains a colorant in the stock, preferably 5 to 10% by weight of liquid coloring agent in relation to the weight of the finished paper. The colorant is a coloring agent which fixes directly in the cellulose. The paper is suitable for printing and/or writing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.