Process for making multicolored photographic slides and apparatu

Details Process for making multicolored photographic slides and apparatu Process for making multicolored photographic slides and apparatu

1978-09-05

1980-01-15

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Methods

355 53, 355 88, G03B 2732, G03B 2704, G03B 2742

Patent

active

041836634

ABSTRACT:
Multicolored photographic slides, such as used for business or technical presentations, are produced by color photographing through a black and white negative back-lighted with a first color and then photographing a corresponding black and white positive back-lighted with a second color on the same colored slide film. Additional colors may be obtained by photographing through stacked negatives and positives in which portions of the negative have been selectively opaqued. The precision film registration required for the process is obtained by a novel platen assembly having spring-biased sprockets that engage the film perforations to firmly and accurately position the film.

REFERENCES:
patent: 1508509 (1924-09-01), Douglass
patent: 2693126 (1954-11-01), Pohl
patent: 2927857 (1960-03-01), Pohl
patent: 3264106 (1966-08-01), Alldis
patent: 3306176 (1967-02-01), Myers
patent: 3741649 (1973-06-01), Podesta et al.
patent: 3941463 (1976-03-01), Wetzel et al.
patent: 4003653 (1977-01-01), Kelly

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