US PATENT SUBCLASS 131 / 340
.~.~ By use of specific filter mass

Current as of: June, 1999
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131 /   HD   TOBACCO

331  DF  SMOKE SEPARATOR OR TREATER {9}
339  DF  .~ Interior surface causes particular flow characteristic {1}
340.~.~ By use of specific filter mass

DEFINITION

Classification: 131/340

By use of specific filter mass:

(under subclass 339) Product or process wherein the surface is part of a particular filter mass, the mass being specifically disclosed in an arrangement to cause the flow of smoke to follow a predetermined or prearranged path.