IPC 2013 : D21B 1/38 : Conserving the finely-divided cellulosic material.

IPC2013 > D > D21 > D21B > D21B 1/00 > D21B 1/38[1] > Conserving the finely-divided cellulosic material.
D SECTION D — TEXTILES; PAPER.
D21 PAPER-MAKING; PRODUCTION OF CELLULOSE.
D21B FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT.
D21B 1/00 Fibrous raw materials or their mechanical treatment (beaters D21D 1/00).
D21B 1/38 · Conserving the finely-divided cellulosic material.