US PATENT SUBCLASS 131 / 215.2
.~.~.~.~.~ With filter

Current as of: June, 1999
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131 /   HD   TOBACCO

329  DF  TOBACCO USERS' APPLIANCE {8}
330  DF  .~ Device used for smoking {21}
200  DF  .~.~ Smoke treating {1}
201  DF  .~.~.~ Material separator and trap {7}
215.1  DF  .~.~.~.~ With valve in smoke path or removable, external passage closure {2}
215.2.~.~.~.~.~ With filter

DEFINITION

Classification: 131/215.2

With filter:

(under subclass 215.1) Subject matter wherein the smoking device includes means for preventing the passage of certain components in the smoke.