US PATENT SUBCLASS 188 / 282.6
.~.~.~.~ Having flow passage, cutout, aperture, slot, etc.

Current as of: June, 1999
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188 /   HD   BRAKES

266  DF  INTERNAL-RESISTANCE MOTION RETARDER {29}
281  DF  .~ Resistance alters relative to direction of thrust member (e.g., high resistance in one direction, low in the other) {1}
282.1  DF  .~.~ Via valved orifice in thrust member {4}
282.5  DF  .~.~.~ Flexible flap-type valve (e.g., compression washers) {1}
282.6.~.~.~.~ Having flow passage, cutout, aperture, slot, etc.

DEFINITION

Classification: 188/282.6

Having flow passage, cutout, aperture, slot, etc.:

(under subclass 282.5) Flexible flap valve in which the platelike member has an opening.