Lightbox

Details Lightbox Lightbox

1991-09-26

1993-07-06

Dorner, Kenneth J.

Card, picture, or sign exhibiting

Photographic transparency viewer, e.g., x-ray viewer

Portable slide viewer

40361, G02B 2702

Patent

active

052242838

ABSTRACT:
A lightbox for cropping photographic negatives using masking cards comprising a pair of side walls spaced from each other and a back wall and a bottom wall disposed between the side walls, A front wall includes a light transparent viewing surface and slopes inwardly relative to the bottom wall at an angle of approximately 45.degree.. A plurality of sets of posts are disposed on the front wall and each set is vertically and horizontally spaced from an adjacent set by a predetermined distance whereby the posts can receive a horizontally arranged array of masking cards to enable an operator to quickly crop negatives for printing. At least one row of compartments is disposed between the front and back walls, each of the compartments in a row being disposed above each of the sets of posts. The compartments and the front wall cooperating to form a housing for a light source.

REFERENCES:
patent: 2233938 (1941-03-01), Jones
patent: 2704901 (1955-03-01), Hulse
patent: 2744345 (1956-05-01), Janning
patent: 3217436 (1965-11-01), Van Wormer, Jr.
patent: 3410012 (1968-11-01), Kumei et al.
patent: 3442039 (1969-05-01), Saizelet
patent: 4071883 (1978-01-01), Dennis
patent: 4375132 (1983-03-01), Tradowsky
patent: 4587753 (1986-05-01), Harper

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