Photographic cassette having pressure plate release of a processor disabling valve
US4084171A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1976 |
| Grant date | Apr 11, 1978 |
| Priority date | — |
| Expiry date | Oct 4, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/265
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus is provided for positively retaining a slidably displaceable valve member in its stored position prior to initiation of the processing cycle in a multi-purpose film cassette of the type containing a photographic film strip for exposure, processing and viewing without removal from the cassette. A latching arm forming a part of the valve member is configured to prevent displacement of the valve member at all times prior to the movement of the pressure plate to the position it occupies during high speed continuous advancement of the film. Movement of the pressure plate to this position results in release of the latching arm and accordingly permits displacement of the valve member to its final position where it serves to seal off the processing fluid nozzle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.