Document with invisible encoded information and method of making the same
US8083264B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2008 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Aug 21, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/382
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A document includes a paper substrate having an average surface roughness of at least about 0.5 microns, wherein the paper substrate includes encoded information printed thereon, and wherein the encoded information is printed with an ink comprised of light absorbing material that absorbs light only at wavelengths below 350 nm and an optional clear binder in a solvent. The encoded information is substantially not detectable to a naked human eye through differential gloss or exposure to light having wavelengths of 365 nm or more, and is only revealed upon exposing the document to light having a wavelength at which the light absorbing material absorbs light, which is less than 350 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.