Laser engraved verification hologram and associated methods
US5331443A · kind A · utility
168Cited by
16References
36Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1992 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Jul 31, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2260/62
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for increasing the authentication effect of a verification hologram to be affixed to a protected document includes laser etching individualized indicia into the reflective layer of each hologram produced en masse on a moving, continuous web. The laser is finely focused and guided by a computer which records the data used to form the selected indicia, such data being referenced for comparison to provide verification of authenticity upon presentation by a bearer. In one embodiment, the data used to create the indicia is generated by a computer program which may include a random number generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.