Thermoplastics sheets or composite sheets with optical inhomogen

Details Thermoplastics sheets or composite sheets with optical inhomogen Thermoplastics sheets or composite sheets with optical inhomogen

1976-08-31

1978-07-04

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

40 22, 283 7, 283 8R, 428213, 428500, 428522, 428915, B42D 1500, B32B 700, A44C 300

Patent

active

040989402

ABSTRACT:
The present invention is related to a sheet or a composite sheet made of transparent thermoplastics with optical inhomogeneities according to a desired and reproducible pattern, which are not discernible with an unaided eye, and which produce polarization-optical patterns when placed in a polarization-optical arrangement. The invention is further related to a process for the manufacture of such a sheet or composite sheet and to their use for the manufacture of counterfeit-proof official documents.

REFERENCES:
patent: 3412493 (1968-11-01), French
patent: 3610120 (1971-10-01), Morse et al.
patent: 3655494 (1972-04-01), Buzzell
patent: 3679448 (1972-07-01), Tramposch
patent: 3679449 (1972-07-01), Nagot et al.
patent: 3919447 (1975-11-01), Kilmer et al.
patent: 3961956 (1976-06-01), Fukuda et al.

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