US PATENT SUBCLASS 352 / 221
GATES

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

221GATES {9}
222  DF  .~> Fluid pressure type
223  DF  .~> With pressure rollers
224  DF  .~> With edge guide
225  DF  .~> With reciprocating pressure plate
226  DF  .~> With removable aperture plate
227  DF  .~> With pressure plate tension control
228  DF  .~> With curved film plane
229  DF  .~> With gate moving and/or holding structure {1}
231  DF  .~> With lens mounting

DEFINITION

Classification: 352/221

(under the class definition) Subject matter including structure in the optical path which positions the motion picture carrier, usually a film strip, in the focal plane of the optical means, and masks the carrier edges such that a single picture area (i.e., a frame) is presented to the optical path.

(1) Note. Usually the gate includes an apertured or aperture plate for framing which has one surface conjugate to the focal plane and a pressure exerting plate usually for positioning the carrier, in relation to said surface.

(2) Note. This subclass 221 includes all gates for carriers other than the film strips as well as film strip gates not provided for below. The indented subclasses below are limited to gates for film strip picture carriers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

27+, for sound accompanied motion picture apparatus with film

gates which have provisions for sound transducers.

SEE OR SEARCH CLASS 353, Optics: Image Projectors,

23, 24, 95, and 96 for an image projector having a film gate.