End and encoded mass distributable response piece and method of

Details End and encoded mass distributable response piece and method of End and encoded mass distributable response piece and method of

1990-12-10

1992-08-11

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

By removeable material

53411, 531314, 53493, 235375, 253 56, 253 57, 253 58, B42D 1500

Patent

active

051373041

ABSTRACT:
A method of simultaneously encoding successive groups of printed paper sheets or mass distributable material wherein the sheets are provided with unperceptable and virtually invisible common code pattern by laser means which is supplied with a distinct series of coded pulse signals in synchronism with control pulses to produce a different optically-scannable coded hole pattern on each group of printed sheets.

REFERENCES:
patent: 4723212 (1988-02-01), Mindrum et al.
patent: 4752675 (1988-06-01), Zetmeir
patent: 4908761 (1990-03-01), Tai
patent: 4910672 (1990-03-01), Ofl et al.
patent: 4939888 (1990-07-01), Katz et al.

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