Polychromic reproduction procedure using strippable masks

Details Polychromic reproduction procedure using strippable masks Polychromic reproduction procedure using strippable masks

1977-09-22

1978-08-22

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Methods

96 5, 96 30, 355125, G03B 2732, G03B 2728, G03C 704, G03F 100

Patent

active

041085493

ABSTRACT:
The claimed reproduction procedure avoids the use of as many masks as there are degrees of shading for each primary color.
For each primary color, only a single mask capable of being stripped and not painted in gouache is used. This mask serves as the mask assignable to the most densely shaded areas, and then upon stripping, as each of the masks assignable to the less densely shaded areas and so on to the weakest density. The mask acts as a photomask for a film which is underexposed for each degree of shading desired bymeans of a single screen.
The invention is applicable to the reproduction of all documents using a number of shades of color.

REFERENCES:
patent: 70564 (1867-11-01), Heddon
patent: 1092545 (1914-04-01), Snapp
patent: 1818080 (1931-08-01), Miller
patent: 2246561 (1941-06-01), Wheelan et al.
patent: 2289738 (1942-07-01), Seymour
patent: 2385599 (1945-09-01), Ball et al.
patent: 3337343 (1967-08-01), Hove

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