The hologram, or other diffraction pattern, is formed by casting a surface relief pattern directly onto the...http://www.google.es/patents/US4933120?utm_source=gb-gplus-sharePatente US4933120 - Combined process of printing and forming a hologram B???squeda avanzada de patentes N???mero de publicaci???nUS4933120 ATipo de publicaci???nConcesi???n N???mero de solicitudUS 07/183,005 Fecha de publicaci