Sheet printed with invisible inks

Details Sheet printed with invisible inks Sheet printed with invisible inks

1978-12-04

1982-03-30

Hess, Bruce H.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

106 21, 282 275, 427145, 427288, 428 29, 428537, 428915, 428916, B41M 512

Patent

active

043224660

ABSTRACT:
The invention relates to a developable surface comprising a carrier layer having thereon at least two deposits of one or more invisible inks in adjacent or overlapping relationship, said deposits in the developed state being unresolvable.

REFERENCES:
patent: 2355884 (1944-08-01), McIntosh
patent: 2601161 (1952-06-01), McIntosh
patent: 3363336 (1968-01-01), Skinner et al.
patent: 3363337 (1968-01-01), Skinner et al.
patent: 3363338 (1968-01-01), Skinner et al.
patent: 3525630 (1970-08-01), Phillips
Daily Telegram-Guide to Gravure Printing, London, 1968, pp. 2-13.

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