US 4,184,700 · Granted 1980-01-22
Documents embossed with optical markings representing genuineness information
There is disclosed a document comprising a flat support member of non-thermoplastic material at least partly coated with a thermoplastic coating, in which coating are embossed optical markings having a light-modifying relief structure, said markings representing information indicating the genuineness or identity of the document. There is also disclosed a process for producing such a document, and an embossing die for use in such a process.
Patent details
- Publication number
- US 4,184,700
- Filing date
- 1978-09-01
- Grant date
- 1980-01-22
- Assignee
- Lgz Landis & Gyr Zug Ag
- Inventor(s)
- GREENAWAY, DAVID L
- CPC class
- G06K19/16
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