Anticounterfeit security device . . . including two security ele

Details Anticounterfeit security device . . . including two security ele Anticounterfeit security device . . . including two security ele

1995-12-08

1996-12-10

Gonzalez, Frank

Optics: measuring and testing

Document pattern analysis or verification

356 72, 324226, 324235, G06K 974, G01N 2100, G01N 2772, G01R 3312

Patent

active

055836313

ABSTRACT:
An anti-counterfeit security device for documents in general in the form of a tape-like or filament-like supporting element made of polyester. On the tape or filament, a first security element is provided which can be detected by devices and is constituted by regions made of a material which can be detected by magnetoresistors and are arranged in succession to generate a signal that can be decoded by the magnetoresistors, and a second security element is also provided, visually detectable in transmitted light, which is constituted by portions of the regions that are free from the magnetoresistor-detectable material in order to form graphic markings optically perceivable in transmitted light.

REFERENCES:
patent: 3599153 (1971-08-01), Lewis
patent: 4180207 (1979-12-01), Lee
patent: 4244998 (1981-01-01), Smith
patent: 4303949 (1981-12-01), Peronnet
patent: 4518919 (1985-05-01), Ishida
patent: 4756557 (1988-07-01), Kaule et al.
patent: 4941687 (1990-07-01), Grane
patent: 5161829 (1992-11-01), Detrick et al.

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