US PATENT SUBCLASS 131 / 213
.~.~.~.~ Plural reversely extending passages

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
213.~.~.~.~ Plural reversely extending passages

DEFINITION

Classification: 131/213

(under subclass 201) Smoking devices having a plurality of smoke passages, connected in series, to extend in substantially opposite directions, so that the smoke reverses its direction of travel.

(1) Note. Compare also with subclasses 212.1+ of this class.

SEE OR SEARCH THIS CLASS, SUBCLASS:

197, and 218, for similarly arranged passages.