the marking being a hologram or diffraction grating

Full Title

Record carriers for use with machines and with at least a part designed to carry digital markings > characterised by the kind of the digital marking, e.g. shape, nature, code > using markings of different kinds in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means > at least one kind of marking being used for authentication, e.g. of credit or identity cards > the marking being sensed by radiation > the marking being a hologram or diffraction grating

Classification Context

Section:

PHYSICS

Class:

COMPUTING OR CALCULATING; COUNTING

Subclass:

GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS