US PATENT SUBCLASS 604 / 405
.~ Filter for purifying or washing air entering container

Current as of: June, 1999
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604 /   HD   SURGERY

403  DF  CONTAINER FOR BLOOD OR BODY TREATING MATERIAL, OR MEANS USED THEREWITH (E.G., NEEDLE FOR PIERCING CONTAINER CLOSURE, ETC.) {8}
405.~ Filter for purifying or washing air entering container

DEFINITION

Classification: 604/405

Filter for purifying or washing air entering container:

(under subclass 403) Subject matter including a solid filter or liquid trap for removing impurities in air entering a receptacle by entrapment in either a filter or a liquid.