Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Physical developing
Patent
1982-06-14
1984-05-01
Gonzales, John
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
Physical developing
430501, G03B 1726
Patent
active
044457685
ABSTRACT:
A photographic film assemblage including a film spool about which is wound a length of resilient material including a strip of photographic film and an opaque leader. The opaque leader is provided along its sides with a series of integral tabs which are adapted to be displaced from the plane of the leader by a film metering sprocket of a camera during movement of the film. The resiliency of the tabs results in those located in the ultimate convolution of the roll of material being displaced from the curved plane of the ultimate convolution thereby leaving voids or apertures therein. When the tabs appear in both the ultimate and penultimate convolutions of the roll, some of the tabs in the penultimate convolution enter the apertures in the ultimate convolution thereby deterring clockspringing of the roll. When the tabs are located in the plane of the leader, they function to substantially prevent the passage of light to underlying convolutions of film.
REFERENCES:
patent: 2541476 (1951-02-01), Mihalyi
patent: 3433637 (1969-03-01), Bachelder
patent: 3613876 (1971-10-01), Kohler et al.
patent: 3690451 (1972-09-01), Nerwin
patent: 4295713 (1981-10-01), Edwards
Corrigan Alfred E.
Gonzales John
Polaroid Corporation
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