Patent · US Active

Security marking authentication device

US8985463B2 · kind B2 · utility

4Cited by
11References
9Claims
0Family size

Assignee

Inventors

Key dates

Filing dateOct 9, 2007
Grant dateMar 24, 2015
Priority date—
Expiry dateNov 25, 2030

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG07D7/12
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

The invention discloses an authentication device for the visual authentication of a document or item comprising a circular polarizing security marking, said device comprising a light source and polarization filters for the either parallel or alternate illumination of said marking on said document with left- and right-circular polarized light. Corresponding methods for the visual and the automated authentication of the marking are disclosed as well.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.