US PATENT SUBCLASS 414 / 221
.~ Including serially arranged valves in path having a vertical component (e.g., airlocks, etc.)

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}
221.~ Including serially arranged valves in path having a vertical component (e.g., airlocks, etc.)

DEFINITION

Classification: 414/221

Including serially arranged valves in path having a vertical component (e.g.,., airlocks, etc.):

(under subclass 217) Apparatus wherein the enabling and inhibiting means includes two or more successive valves, located in a path wherein the material moves under the influence of gravity, which cooperate one with another to receive, isolate, and release a quantity of material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

169+, and 220+, for material supporting structure having serially arranged closures which release material into a heating chamber.

SEE OR SEARCH CLASS

406, Conveyors: Fluid Current,

62+, 124+ and 169 for air locks associated with fluid current conveyors.