Transient optical state change materials useful in...

Details Transient optical state change materials useful in... Transient optical state change materials useful in...

C - Chemistry, Metallurgy

07

D

C07D 279/18 (2006.01) G11B 7/24 (2006.01)

Patent

CA 2503684

Phenothiazole compounds being substituted in at least the 3 and 7 positions with electron donating and electron withdrawing moeties. These include those shown in figure 1. These are useful in providing copy-protection for optical data storage media.

L'invention porte sur un support optique protégé contre la copie et comprenant des matériaux de sécurité transitoires à modification d'état optique qui présentent une modification de leur état optique lorsqu'ils sont exposés à des longueurs d'ondes comprises entre environ 770 nm et environ 830 nm.

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