Motion picture film cassette having removable film stripping web
US4212521A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 1978 |
| Grant date | Jul 15, 1980 |
| Priority date | — |
| Expiry date | Nov 29, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/265
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An emulsion stripping apparatus for removing spent layers of photographic materials from a film strip connected permanently at opposite ends to supply and take-up spools rotatable within a multi-purpose cassette in which the film strip is contained without removal during exposure, processing and projection. A stripping web of the same width as the film strip is connected releasably at one end on the supply spool and extends to the take-up spool but is not physically connected to the take-up spool. When a processing operation occurs in which the film strip is coated with processing fluid and rewound on the supply spool, the stripping web becomes interwound with the processed film strip. At the end of such processing rewind, the end of the stripping web initially extending to the take-up spool now extends in a general tangential direction from the periphery of the filled supply spool. On reverse rotation of the supply spool, such as during an ensuing projection cycle, the free end of the stripping web is directed by a deflector through an opening in the cassette to be discarded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.