US PATENT SUBCLASS 352 / 144
.~ Fire trap


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

143  DF  WITH FILM STRIP FIRE PREVENTION OR ISOLATION {4}
144.~ Fire trap {1}
145  DF  .~.~> With film severing


DEFINITION

Classification: 352/144

(under subclass 143) Subject matter including means to extinguish the combustion of a film by providing either a passageway for the film of such dimensions as to freely pass the motion picture film but to limit the amount of air to a level insufficient to support combustions or by providing a movable member which moves against the film under combustion condition.