System for authenticating printed or reproduced documents
US5714291A · kind A · utility
33Cited by
9References
21Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 23, 1993 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Dec 23, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09321
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved laser printer or photocopier toner for authentication is made by mixing conventional toner particles with submicron ultraviolet sensitive particles that exhibit detectable characteristics in response to ultraviolet radiation. A document printed using the improved toner can be authenticated using a UV scanner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.