Planar card made of a thermoplastic material having visually rec

Details Planar card made of a thermoplastic material having visually rec Planar card made of a thermoplastic material having visually rec

1982-02-19

1985-03-26

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283 74, 283 94, 283 98, 283111, 283904, B42D 4500

Patent

active

045069166

ABSTRACT:
A card is disclosed which is made of a thermoplastic material and having visually recognizable, internal safety markings. The card comprises a first sheet of a transparent thermoplastic material and a second sheet of an opaque thermoplastic material. The second sheet has an inner surface provided with a relief structure such that the varying thickness of the opaque material will influence the local absorption of transmitted light. The first sheet has an inner surface provided with a corresponding negative relief structure. The first and second sheets are laminated together with their inner faces in contact to form an interface. Thus, when viewing the card in transmitted light, the relief structure is visually recognizable as a varying brightness due to varying absorption of the light transmitted through the opaque sheet.

REFERENCES:
patent: 3412493 (1968-11-01), French
patent: 3604901 (1971-09-01), Morita et al.
patent: 3758970 (1973-09-01), Annenberg
patent: 3814904 (1974-06-01), Russell et al.
patent: 3930924 (1976-01-01), Oka et al.
patent: 4033059 (1977-07-01), Hutton
patent: 4124947 (1978-11-01), Kuhl et al.
patent: 4184700 (1980-01-01), Greenaway
patent: 4298217 (1981-11-01), Moraw et al.
patent: 4307899 (1981-12-01), Hoppe

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