Film cassette with removable light trap
US5257751A · kind A · utility
0Cited by
9References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1992 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Jun 1, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a film cassette, a cartridge shell has respective sections that are asssembled together to define an internal film chamber and a film passageway leading out of the chamber. A light-trapping material is located in the passageway to prevent ambient light from entering the chamber. According to the invention, at least one of the shell sections has a frame device hingedly connected to the one section for folding against the one section to secure the light-trapping material in place and for unfolding to release the light-trapping material to permit it to be removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.