Film cassette

Details Film cassette Film cassette

1989-01-12

1989-12-12

Hix, L. T.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 711, G03B 1726

Patent

active

048871109

ABSTRACT:
A film cassette is adapted to propel a leading portion of a filmstrip from a light-tight cassette shell in response to rotation of a film spool in an unwinding direction. When the leading portion is advanced to exit the cassette shell, it falls off an exposure-not-completed indicator support to uncover the support. At the same time, the filmstrip continues to cover an exposure-completed indicator support. The exposure-completed indicator support is only uncovered when a trailing portion of the filmstrip falls off the support, after all of the available imaging areas of the filmstrip have been exposed. Conversely, should the filmstrip be rewound into the cassette shell midroll, i.e. before all of its imaging areas have been exposed, the exposure-completed indicator support remains covered. Thus, respective indications can be provided that the filmstrip is either partly or fully used.

REFERENCES:
patent: 1685010 (1928-09-01), Thornton
patent: 3467341 (1969-09-01), Roman
patent: 3684206 (1972-08-01), Edwards
patent: 3747865 (1973-07-01), Tobey
patent: 3768894 (1973-10-01), Cook
patent: 4395107 (1983-07-01), Luhrig et al.

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