Film cassette with exposure status indicator
US5048770A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1990 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | May 29, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film cassette comprises a spool rotatable about an axis to thrust a filmstrip coiled about the spool out of the cassette shell, and an exposure status indicator rotatable about the axis from an unexposed position to an exposed position for providing respective indications that the filmstrip is unexposed or is exposed. According to the invention, the shell and the status indicator include respective engagable means at least one of which is supported for movement relative to the other substantially radially of the axis in opposite directions for engagement to secure the status indicator in its unexposed and exposed positions and for disengagement to permit rotation of the status indicator from the unexposed to the exposed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.