# US 4,391,902 A · Photographic film with variable windows

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- Number: US 4,391,902 A
- Document ID: US4391902A
- Status: Granted
- Kind: A
- Application number: 06/310,882
- Filed: 1981-10-13
- Granted: 1983-07-05
- Earliest claimed: 1981-10-13
- Inventors: Robert F. Wilde
- Web page: https://patentgrep.com/patent/US4391902A

## CPC

- G03C 3/00: Packages of films for inserting into cameras, e.g. roll-films, film-packs; Wrapping materials for light-sensitive plates, films or papers, e.g. materials characterised by the use of special dyes, printing inks, adhesives (wrapping materials in general B65D)
- G03C 1/765: characterised by the shape of the base, e.g. arrangement of perforations, jags
- G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G)

## Abstract

A photographic film including at least two elongated film strips of photosensitive material each divided into a sequence of longitudinally spaced frames and arranged in face-to-face superposed relation with the frames of the strips being longitudinally aligned, one of the film strips having certain of the frames free of photosensitive material whereby light from an image to be photographed is adapted to pass therethrough for registry on the adjacent strip with the strips being reeled on a single reel.

## Claims

### Claim 1

A film product comprising at least two elongated film strips of photosensitive material each divided into a sequence of longitudinally spaced frames and arranged in face-to-face, superposed relation with the frames of the strips being longitudinally aligned, one of said film strips having certain of the frames thereof free of said photosensitive material whereby light from an image to be photographed is adapted to pass therethrough for registry on the next adjacent superposed strip, said strips being wound on a single spool.

### Claim 2 (depends on 1)

The product of claim 1 in which one of said strips is equipped with photosensitive material adapted to register an image in black and white while another of said strips is equipped with photosensitive material adapted to register an image in color.

### Claim 3 (depends on 1)

The product of claim 1 in which said one strip has frame portions removed to permit said light passage.

### Claim 4 (depends on 3)

The product of claim 3 in which said one strip is equipped with photosensitive material adapted to register an image in black and white, a second strip being positioned therebehind in the path of light travel and equipped with photosensitive material adapted to register an image in color.

### Claim 5 (depends on 1)

The product of claim 1 in which said certain frames are arranged in adjacent pairs, a next adjacent film being equipped with frames adapted to pass light through only one of said certain frames, and a third strip equipped with photosensitive material adapted to register an image from light passing through said one and next adjacent strips.

### Claim 6

A film product comprising at least two elongated film strips of photosensitive material each divided into a sequence of longitudinally spaced frames and arranged in face-to-face, superposed relation with the frames of the strips being longitudinally aligned, one of said film strips having certain of the frames thereof free of said photosensitive material whereby light from an image to be photographed is adapted to pass therethrough for registry on the next adjacent superposed strip, said product being equipped with index openings along the longitudinal sides thereof for film movement in a camera, said product being reeled on a single reel so as to position said one strip first in the path of light from an image to be photographed.