Patent ID: 8343569

Claim:
A method for marking an object with a laser markable security marking, comprising the steps of: providing a laser markable security laser transfer film that includes a carrier web formed from a laser light-transmissive material having a taggant-containing film disposed on a first side of the carrier web, the taggant-containing film formulated from an energy sensitive taggant capable of withstanding temperatures of about 1800° F. to about 2200° F., the taggant absorbing energy at a first, predetermined wavelength and, in response, emitting energy at a second, different wavelength, the taggant-containing film further formulated from a polymeric resin; positioning the laser markable security laser transfer film adjacent the object with the taggant-containing film on the object; directing a laser light through the web from a second side, in a first pass, to heat the taggant-containing film and directing the laser light through the web from the second side, in a second pass, to fuse the taggant-containing film onto the object, the taggant-containing film absorbing energy at the first, predetermined wavelength, a portion of the taggant-containing film being transferred onto the object to form a taggant-containing marking on the object and emitting energy at the second different wavelength; detecting, by a sensor, the energy emitted from the taggant-containing film at the second different wavelength; and indicating the sensed energy at the second, different predetermined wavelength.