1. CPC Sections
  2. CPC Section D
  3. CPC Class D21
  4. CPC Subclass D21B
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CPC
COOPERATIVE PATENT CLASSIFICATION
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D21B
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT [2018-08]
WARNING

  • In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.
D21B 1/00
Fibrous raw materials or their mechanical treatment (pretreatment of the finely-divided materials before digesting D21C 1/00; methods of beating or refining pulp D21D 1/00; purification of the pulp suspension by mechanical means D21D 5/00) [2016-11]
D21B 1/02
.
Pretreatment of the raw materials by chemical or physical means (removal of bark B27L) [2013-01]
D21B 1/021
. .
{by chemical means} [2013-01]
D21B 1/023
. .
{Cleaning wood chips or other raw materials} [2013-01]
D21B 1/025
. .
{Separating pith from fibrous vegetable materials} [2013-01]
D21B 1/026
. .
{Separating fibrous materials from waste} [2013-01]
D21B 1/028
. . .
{by dry methods} [2013-01]
D21B 1/04
.
by dividing raw materials into small particles, e.g. fibres (breaking-up or cutting wood or the like by dry methods B27L; mechanical separation of fibres from plant material D01B 1/00; hackling or heckling machines D01B 5/00) [2016-11]
D21B 1/06
. .
by dry methods [2013-01]
D21B 1/061
. . .
{using cutting devices} [2013-01]
D21B 1/063
. . .
{using grinding devices} [2013-01]
D21B 1/065
. . . .
{of the magazine type} [2013-01]
D21B 1/066
. . .
{the raw material being pulp sheets} [2013-01]
D21B 1/068
. . . .
{by cutting actions} [2013-01]
D21B 1/08
. . .
the raw material being waste paper (chemical part D21C 5/02); the raw material being rags [2013-01]
D21B 1/10
. . . .
by cutting actions [2013-01]
D21B 1/12
. .
by wet methods, by the use of steam (beaters D21D 1/00) [2013-01]
D21B 1/14
. . .
Disintegrating in mills [2016-11]
D21B 1/16
. . . .
in the presence of chemical agents [2013-01]
D21B 1/18
. . . .
in magazine-type machines [2013-01]
D21B 1/20
. . . . .
with chain feed [2013-01]
D21B 1/22
. . . . .
with screw feed [2013-01]
D21B 1/24
. . . . .
of the pocket type [2013-01]
D21B 1/26
. . . .
Driving or feeding arrangements [2013-01]
D21B 1/28
. . . .
Dressers for mill stones, combined with the mill [2013-01]
D21B 1/30
. . .
Defibrating by other means [2013-01]
D21B 1/303
. . . .
{using vibrating devices} [2013-01]
D21B 1/306
. . . .
{using microwaves} [2013-01]
D21B 1/32
. . . .
of waste paper [2013-01]
D21B 1/322
. . . . .
{coated with synthetic materials} [2013-01]
D21B 1/325
. . . . .
{de-inking devices} [2013-01]
D21B 1/327
. . . . . .
{using flotation devices} [2013-01]
D21B 1/34
. . . .
Kneading or mixing; Pulpers [2013-01]
D21B 1/342
. . . . .
{Mixing apparatus} [2013-01]
D21B 1/345
. . . . .
{Pulpers} [2013-01]
D21B 1/347
. . . . . .
{Rotor assemblies} [2013-01]
D21B 1/36
. . . .
Explosive disintegration by sudden pressure reduction [2013-01]
D21B 1/38
.
Conserving the finely-divided cellulosic material [2013-01]