Instant processing film unit having internal dark slide

Details Instant processing film unit having internal dark slide Instant processing film unit having internal dark slide

1977-09-19

1979-04-10

Schilling, Richard L.

Gas separation: apparatus

Electric field separation apparatus

Plural diverse electric fields

354304, G03C 148, G03D 902

Patent

active

041486510

ABSTRACT:
An instant-processing film unit of the preregistered, integral type includes an internal dark slide which protects the unit from exposure prior to use. The film unit includes a photosensitive element and a cover sheet between which the dark slide is removeably positioned to shield one side of the photosensitive element from light. Exposure from the other side is prevented by an opaque layer in the element itself. When used with an opaque processing composition, the unit can be handled in daylight, without fogging, both before and after exposure. The film unit is adapted for use in commercially available adapters for professional type cameras.

REFERENCES:
patent: 406085 (1889-07-01), Carlisle
patent: 2472358 (1949-06-01), Wolff
patent: 2740714 (1951-06-01), Bachelder et al.
patent: 3854312 (1974-12-01), Sorli
patent: 3963496 (1976-06-01), Arisaka

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