Photographic film cassette
US5211348A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1992 |
| Grant date | May 18, 1993 |
| Priority date | — |
| Expiry date | Jan 28, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic film cassette has a photographic film leader, which is advanced outwardly from a cassette shell when a spool is rotated. The spool has two flanges, of which a first one is loosely fitted on a core of the spool. A circumferential lip projects from an inside surface of the first flange toward a photographic filmstrip, contacts on a lateral side of a roll of the filmstrip, and prevents the roll from loosening. The first flange together with the lip is formed according to thermoforming from a sheet of thermoplastic resin having a melt index of 4 or less so as to have a high intensity, and has a thickness of 0.4 mm or less so as to be deformable with a small force.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.