Security paper

Details Security paper Security paper

1986-12-05

1989-09-05

Kendell, Lorraine T.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

162140, 162162, 428206, 428211, 4285377, 428916, B32B 300, B32B 700, D21H 380

Patent

active

048637831

ABSTRACT:
Paper embodying for purposes of identification one or more pigments, inconspicuous in daylight but visible on inspection in darkened surroundings or after illumination at predetermined wavelength from an artificial source, wherein the pigment is in the form of granules which are of 30 to 500 microns particle size and, to secure contrast between the pigment and background in said inspection, are essentially free of finer particles.

REFERENCES:
patent: 3128222 (1964-04-01), Herschler et al.
patent: 3201352 (1965-08-01), Jayme et al.
patent: 3258392 (1966-06-01), Brill et al.
patent: 3429825 (1969-02-01), Voedisch
patent: 3876496 (1975-04-01), Lozano
patent: 3880706 (1975-04-01), Williams
patent: 4136229 (1979-01-01), Godet et al.
patent: 4166644 (1979-09-01), Kay et al.
patent: 4198268 (1980-04-01), Frei et al.

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