Security fibers and other materials made luminescent by a dyeing

Details Security fibers and other materials made luminescent by a dyeing Security fibers and other materials made luminescent by a dyeing

1989-06-13

1990-05-01

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

8648, 283 89, 283 92, 283 903, B42D 1500

Patent

active

049212800

ABSTRACT:
The invention relates to security fibers and other allied materials made luminescent by a dyeing process employing rare-earth compounds and their applications in fiduciary documents and other materials requiring authentication.

REFERENCES:
patent: 3473027 (1969-10-01), Freeman et al.
patent: 3614430 (1971-10-01), Berker
patent: 4219599 (1980-08-01), Idelson et al.
patent: 4387112 (1983-06-01), Blach
patent: 4442170 (1984-04-01), Kaule et al.
patent: 4451521 (1984-05-01), Kaule et al.
patent: 4451530 (1984-05-01), Kaule et al.
patent: 4583766 (1986-04-01), Wessel

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