Method and apparatus for reading invisible symbol

Details Method and apparatus for reading invisible symbol Method and apparatus for reading invisible symbol

2005-02-22

2005-02-22

Stcyr, Daniel (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S470000

Reexamination Certificate

active

06857573

ABSTRACT:
An article including a substrate and an invisible symbol on the substrate is disclosed. The invisible symbol is formed by a compound which includes a cyano group and has an infrared absorption wavelength apart from that of the substrate when heated.

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patent: 5942742 (1999-08-01), Suhara
patent: 5959296 (1999-09-01), Cyr et al.
patent: 5971276 (1999-10-01), Sano et al.
patent: 6168081 (2001-01-01), Urano et al.
patent: 6471126 (2002-10-01), Urano et al.

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