Film use indicator

Details Film use indicator Film use indicator

1990-04-02

1991-07-16

Hix, L. T.

G03B 1726

Patent

active

050328620

ABSTRACT:
A camera apparatus has a body to receive a canister containing a film spool defining a hollow shaft portion, the hollow shaft portion adapted to receive penetration of a spool rewind plunger carried on the camera body. The canister has an annular end wall with an outer side; and a frangible indicator layer extending proximate the end wall outer side, and carried by the canister; the indicator layer extending in registration with the hollow shaft portion to be punctured or penetrated by the plunger when the canister is assembled into the body, such penetration indicating that film carried by and rewound upon the spool has been exposed.

REFERENCES:
patent: 2303173 (1942-11-01), Roehrl
patent: 4682870 (1987-07-01), Atkinson

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