US PATENT SUBCLASS 352 / 149
.~ Auxiliary fire shutter

Current as of: June, 1999
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352 /   HD   OPTICS: MOTION PICTURES

143  DF  WITH FILM STRIP FIRE PREVENTION OR ISOLATION {4}
149.~ Auxiliary fire shutter {2}
150  DF  .~.~> Film tension responsive {1}
152  DF  .~.~> Feed speed responsive {2}

DEFINITION

Classification: 352/149

(under subclass 143) Subject matter in which the means to prevent combustion of the film strip includes an opaque shutter or screen which is interposed between the projection light source and the film strip.