A self-expiring badge or label that includes an upper substrate having an upper surface and a lower surface and an adhesive activator layer on the lower surface. A protective layer having a first surface and a second surface is provided, with the first surface of the protective layer being removably...http://www.google.fr/patents/US7742366?utm_source=gb-gplus-shareBrevet US7742366 - One piece self-expiring security badge or label with devices to print, activate and issue the time-label automatically
One piece self-expiring security badge or label with devices to print ...
