US PATENT SUBCLASS 414 / 220
.~.~ With means for changing pressure in trap chamber

Current as of: June, 1999
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414 /   HD   MATERIAL OR ARTICLE HANDLING

217  DF  APPARATUS FOR MOVING MATERIAL BETWEEN ZONES HAVING DIFFERENT PRESSURES AND INHIBITING CHANGE IN PRESSURE GRADIENT THEREBETWEEN {3}
219  DF  .~ Including trap chamber having horizontal axis of rotation {1}
220.~.~ With means for changing pressure in trap chamber

DEFINITION

Classification: 414/220

With means for changing pressure in trap chamber:

(under subclass 219) Apparatus wherein the device includes means for changing the pressure within the one or more chambers as they move between the regions.