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Outline
Indent Level
Color Curly Brackets (indicating CPC extensions to IPC)

CPC
COOPERATIVE PATENT CLASSIFICATION
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FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
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Fibrous raw materials or their mechanical treatment
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.
Pretreatment of the raw materials by chemical or physical means (removal of bark B27L)
. .
{
by chemical means
}
D21B 1/023
. .
{
Cleaning wood chips or other raw materials
}
D21B 1/025
. .
{
Separating pith from fibrous vegetable materials
}
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D21B 1/026
. .
{
Separating fibrous materials from waste
}
D21B 1/028
. . .
{
by dry methods
}
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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; disintegrating peat C10F 7/02; obtaining fibres mechanically for spinning from rags, peat, or the like D01B)
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D21B 1/06
. .
by dry methods
D21B 1/061
. . .
{
using cutting devices
}
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D21B 1/063
. . .
{
using grinding devices
}
D21B 1/065
. . . .
{
of the magazine type
}
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D21B 1/066
. . .
{
the raw material being pulp sheets
}
D21B 1/068
. . . .
{
by cutting actions
}
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D21B 1/08
. . .
the raw material being waste paper (chemical part D21C 5/02); the raw material being rags
D21B 1/10
. . . .
by cutting actions
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D21B 1/12
. .
by wet methods, by the use of steam (beaters D21D 1/00)
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D21B 1/14
. . .
Disintegrating in mills (in general B02C)
D21B 1/16
. . . .
in the presence of chemical agents
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D21B 1/18
. . . .
in magazine-type machines
D21B 1/20
. . . . .
with chain feed
D21B 1/22
. . . . .
with screw feed
D21B 1/24
. . . . .
of the pocket type
D21B 1/26
. . . .
Driving or feeding arrangements
D21B 1/28
. . . .
Dressers for mill stones, combined with the mill
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. . .
Defibrating by other means
D21B 1/303
. . . .
{
using vibrating devices
}
. . . .
{
using microwaves
}
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D21B 1/32
. . . .
of waste paper
D21B 1/322
. . . . .
{
coated with synthetic materials
}
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D21B 1/325
. . . . .
{
de-inking devices
}
D21B 1/327
. . . . . .
{
using flotation devices
}
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D21B 1/34
. . . .
Kneading or mixing; Pulpers
D21B 1/342
. . . . .
{
Mixing apparatus
}
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D21B 1/345
. . . . .
{
Pulpers
}
D21B 1/347
. . . . . .
{
Rotor assemblies
}
D21B 1/36
. . . .
Explosive disintegration by sudden pressure reduction
D21B 1/38
.
Conserving the finely-divided cellulosic material
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013