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Outline
Indent Level
Color Curly Brackets (indicating CPC extensions to IPC) References Date Revised
Search Symbol
CPC
COOPERATIVE PATENT CLASSIFICATION
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TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE [2013‑01]
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Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F) [2013‑01]
D21D 1/002
.
{
Control devices
}
[2013‑01]
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.
{
Methods of beating or refining including disperging or deflaking
}
[2013‑01]
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. .
{
Disc mills
}
[2013‑01]
. . .
{
Discs
}
[2013‑01]
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.
Methods of beating; Beaters of the Hollander type [2013‑01]
D21D 1/04
. .
Beater rolls or bars [2013‑01]
D21D 1/06
. .
Bed plates [2013‑01]
D21D 1/08
. .
Beaters with means for driving the pulp quickly [2013‑01]
D21D 1/10
. .
Beaters with means for regulating the pressure between the beater roll and the bed plate [2013‑01]
D21D 1/12
. .
Beaters with means for continuous pulp discharge [2013‑01]
D21D 1/14
. .
Beaters with one beater roll and with vertical stuff circulation canal [2013‑01]
D21D 1/16
. .
Beaters with means for returning the pulp over the head of the beater roll [2013‑01]
D21D 1/18
. .
Beaters with two or more beater rolls [2013‑01]
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D21D 1/20
.
Methods of refining [2013‑01]
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D21D 1/22
. .
Jordans [2013‑01]
D21D 1/24
. . .
Jordan rolls [2013‑01]
D21D 1/26
. . .
Jordan bed plates [2013‑01]
D21D 1/28
. .
Ball or rod mills [2013‑01]
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D21D 1/30
. .
Disc mills [2013‑01]
D21D 1/303
. . .
{
Double disc mills
}
[2013‑01]
D21D 1/306
. . .
{
Discs
}
[2013‑01]
D21D 1/32
. .
Hammer mills [2013‑01]
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. .
Other mills or refiners [2013‑01]
D21D 1/36
. . .
with vertical shaft [2013‑01]
D21D 1/38
. . .
with horizontal shaft [2013‑01]
. .
Washing the fibres [2013‑01]
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Purification of the pulp suspension by mechanical means; Apparatus therefor (centrifuges, cyclones B04) [2013‑01]
.
{
Forming fibrous aggregates
}
[2013‑01]
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D21D 5/02
.
Straining or screening the pulp [2013‑01]
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D21D 5/023
. .
{
Stationary screen-drums
}
[2013‑01]
D21D 5/026
. . .
{
with rotating cleaning foils
}
[2013‑01]
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D21D 5/04
. .
Flat screens [2013‑01]
D21D 5/043
. . .
{
Vibrating screens
}
[2013‑01]
D21D 5/046
. . .
{
Rotary screens
}
[2013‑01]
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D21D 5/06
. .
Rotary screen-drums [2013‑01]
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D21D 5/08
. . .
combined with a rocking movement [2013‑01]
D21D 5/10
. . . .
of the tank [2013‑01]
D21D 5/12
. . . .
of the screen [2013‑01]
D21D 5/14
. . . .
of the tank and the screen [2013‑01]
D21D 5/16
. .
Cylinders and plates for screens [2013‑01]
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.
with the aid of centrifugal force [2013‑01]
D21D 5/20
. .
in apparatus with a horizontal axis [2013‑01]
D21D 5/22
. .
in apparatus with a vertical axis [2013‑01]
. .
in cyclones [2013‑01]
.
De-aeration of paper stock [2013‑01]
D21D 5/28
.
Tanks for storing or agitating pulp [2013‑01]
Subject matter not provided for in other groups of this subclass [2013‑01]
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013