Photographic duplicators

Details Photographic duplicators Photographic duplicators

1975-07-08

1977-06-28

Griffin, Donald A.

Photocopying

Contact printing

Light boxes

G03B 2722

Patent

active

040322343

ABSTRACT:
A photographic duplicating apparatus comprising a curved film holder for holding a master film and a copy film in close proximity to a preferably elongate tubular light source mounted at the center of curvature of the holder, a shutter which preferably consists of an inner and outer tube mounted coaxially one within the other in the axis of the light source. Preferably a series of units are provided each with an outer tube and holder which rotate sequentially about the inner tube and light source.

REFERENCES:
patent: 2168481 (1939-08-01), Jollasse
patent: 2290478 (1942-07-01), Matlas
patent: 2421150 (1947-05-01), Jacobson
patent: 2990763 (1961-07-01), Frantz
patent: 3401617 (1968-09-01), Rait

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