Non-copying printed document and method of printing same

Details Non-copying printed document and method of printing same Non-copying printed document and method of printing same

1978-03-23

1979-11-27

Goldberg, Howard N.

Printed matter

Calendar

283 8R, 283 58, B42D 1500

Patent

active

041757742

ABSTRACT:
A document with a background printed thereon which includes a first portion formed of small dots and a second portion formed of larger dots. The larger dots are of a size which is reproduced by a copying machine. The small dots are of a size which is not reproduced by the copying machine. When a copy is made, only the larger dots reproduce so that the copy is readily distinguishable from the original.

REFERENCES:
patent: 1675769 (1928-07-01), Smith
patent: 1692405 (1928-11-01), Freeman
patent: 3088841 (1963-05-01), Guertin
patent: 3282720 (1966-11-01), Oleksiw
patent: 3713861 (1973-01-01), Sharp
patent: 3852088 (1974-12-01), Godlewski et al.

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