Douglas A Robinson

US Patent:

42957273, Oct 20, 1981

Filed:

Oct 17, 1978

Appl. No.:

5/952202

Inventors:

Douglas K. Robinson - Edmonds WA

International Classification:

G03D 1308

US Classification:

354298

Abstract:

This invention is directed to a new apparatus to assist in the making of negatives. If the negatives are screen separation negatives, then the screen separation negatives can be used in the making of printing plates. For colored prints there are a plurality of screen separation negatives and a plurality of printing plates. With this apparatus it is possible to develop a screen separation negative to realize a predetermined dot structure. As a result, in a plurality of screen separation negatives there is a more uniform dot structure. With a more uniform dot structure in the screen separation negative there is a more uniform dot structure in the printing plate and therefore a more uniform printed color print. The apparatus indicates when the dot structure, viz. , opaque area and clear area, on the developing screen separation negative reaches a predetermined standard for dot structure or a predetermined standard of transparency to light.

US Patent:

D2690152, May 17, 1983

Filed:

Oct 17, 1978

Appl. No.:

5/952220

Inventors:

Douglas K. Robinson - Edmonds WA

International Classification:

D1604

US Classification:

D16 33