US PATENT SUBCLASS 131 / 345
.~ Including a cellulose ester or ether

Current as of: June, 1999
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131 /   HD   TOBACCO

331  DF  SMOKE SEPARATOR OR TREATER {9}
345.~ Including a cellulose ester or ether

DEFINITION

Classification: 131/345

Including a cellulose ester or ether:

(under subclass 331) Product or process including (a) cellulose which has been treated with an acid to form a cellulose ester, or (b) cellulose which has been treated with an alcohol to form a cellulose ether.