Security paper
US7431798B2 · kind B2 · utility
3Cited by
14References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2001 |
| Grant date | Oct 7, 2008 |
| Priority date | — |
| Expiry date | Dec 5, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24893
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Security paper adapted to resist fraudulent alteration of toner-printed information thereon and to make such alteration or attempts at alteration evident has a maximum Scott-Bond strength of 150 J m−2; a Bendtsen roughness of not more than about 150 ml min−1; and is size press or otherwise treated with a thermally-softenable polymer composition, for example acrylic polymer or copolymer, a polyvinyl acetate polymer, a vinyl acetate/ethylene copolymer, or a vinyl acetate/vinyl chloride/ethylene terpolymer. Preferably the paper has filler content of about 15% to about 20% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.