Film pack
US4236798A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1979 |
| Grant date | Dec 2, 1980 |
| Priority date | — |
| Expiry date | Oct 15, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film pack, which includes a stack of instant-processing film units received in a housing, has a slide plate that is permanently coupled to the housing for reciprocal movement between a first position residing in the stack and a second position removed from the stack. Initially the slide plate serves as a dark slide to shield the film units from fogging through an exposure aperture in the housing. When reciprocated, however, such as in a processing camera, the slide plate is guided to enter the stack behind the forwardmost film unit, and to remove that unit from the housing through an exit slot. The slide plate can also support the forwardmost film unit in the exposure position, shield other than the forwardmost unit from exposure when the film units are transparent, and assist in controlling processing of the film units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.