Film cassette with film exposure status indicator

Details Film cassette with film exposure status indicator Film cassette with film exposure status indicator

1990-05-07

1991-03-26

Hix, L. T.

G03B 1726

Patent

active

050033344

ABSTRACT:
A film cassette comprises a film spool rotatable inside a lighttight cassette shell to thrust a filmstrip coiled about the spool automatically to the exterior of the shell, and a film exposure status indicator movable from an unexposed position for providing a visible indication that the filmstrip is unexposed to respective partly exposed and fully exposed positions for providing visible indications that the filmstrip is only partly exposed or is substantially exposed. According to the invention, the spool and the status indicator include engagable means for moving the status indicator to its exposed position from its unexposed and partly exposed positions only in response to rotation of the spool.

REFERENCES:
patent: 4423943 (1984-01-01), Gold
patent: 4802633 (1989-02-01), Beery
patent: 4834306 (1989-05-01), Robertson et al.
patent: 4846418 (1989-07-01), Fairman
patent: 4848693 (1989-07-01), Robertson
patent: 4875638 (1989-10-01), Harvey
patent: 4887110 (1989-12-01), Harvey
patent: 4894673 (1990-01-01), Beach

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