US PATENT SUBCLASS 352 / 228
.~ With curved film plane

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

221  DF  GATES {9}
228.~ With curved film plane

DEFINITION

Classification: 352/228

(under subclass 221) Subject matter in which the gate includes motion picture film positioning structure constraining the film to a curved plane corresponding to the curved focal plane of the lens.