Instant processing film unit
US4148652A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 19, 1977 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Sep 19, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/44
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An instant-processing film unit of the preregistered type is adapted for use in commercially available adapters for professional type cameras. The film unit includes a photosensitive element for recording a processable latent image, a cover sheet for facilitating the distribution of a processing composition over the element, and an internal dark slide removably positioned between the photosensitive element and cover sheet for shielding one side of the element from premature exposure. The dark slide extends from between the photosensitive element and cover sheet through an opening at one end of the film unit, and is provided with an opaque hood which is attached to the dark slide and encloses the opening to protect such end from light leaks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.