Film cassette
US4880179A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 12, 1989 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Jan 12, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film cassette is disclosed wherein a film spool having a filmstrip coiled about it is selectively rotatable in opposite directions to advance a leader portion of the filmstrip through a film passage slit to the outside of the cassette shell and to return the leader portion to the inside of the cassette shell. A pile-like material, such as velvet or plush, consisting of short close flexible fibers is secured to the cassette shell along the film passage slit to prevent ambient light substantially from entering the slit. The leader portion has at least one hole adapted to receive a sufficient number of the fibers to allow the fibers to engage the leader portion to prevent its casual creep rearward in the film passage slit. The fibers have a resistance to displacement from the hole which can easily be overcome by rotating the film spool to move the leader portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.