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

CPC
COOPERATIVE PATENT CLASSIFICATION
Collapse
PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
Collapse
Wet end of machines for making continuous webs of paper
.
{
Regulating the freeness of the pulp
}
.
{
Devices for dispensing fibres in a fluid
}
Collapse
.
{
Screen-cloths
}
Collapse
D21F 1/0036
. .
{
Multi-layer screen-cloths
}
. . .
{
Triple layer fabrics
}
D21F 1/0054
. .
{
Seams thereof
}
D21F 1/0063
. .
{
Perforated sheets
}
D21F 1/0072
. .
{
Link belts
}
D21F 1/0081
. .
{
with single endless strands travelling in generally parallel convolutions
}
.
{
Fibre-rearranging devices
}
Collapse
.
Head boxes of Fourdrinier machines
. .
{
Means for injecting material into flow within the headbox
}
D21F 1/024
. .
{
Details of the feed chamber
}
D21F 1/026
. .
{
Details of the turbulence section
}
D21F 1/028
. .
{
Details of the nozzle section
}
Collapse
D21F 1/04
.
Head boxes of cylinder machines
D21F 1/043
. .
{
with immersed cylinders
}
D21F 1/046
. .
{
with non-immersed cylinder
}
Collapse
.
Regulating pulp flow
D21F 1/065
. .
{
Shock-absorbing devices
}
.
Regulating consistency
Collapse
.
Wire-cloths (production of wire-cloths B21F)
D21F 1/105
. .
{
Multi-layer wire-cloths
}
Collapse
D21F 1/12
. .
Seams thereof
D21F 1/14
. . .
welded
D21F 1/16
. . .
sewn
Collapse
.
Shaking apparatus for wire-cloths and associated parts
. .
in fourdrinier machines
. .
in cylinder machines
Collapse
.
Tilting, raising, or lowering mechanisms for wire-cloths
. .
in Fourdrinier machines
. .
in cylinder machines
.
Protecting wire-cloths from mechanical damage
Collapse
.
Washing wire-cloths or felts
D21F 1/325
. .
{
with reciprocating devices
}
Collapse
D21F 1/34
.
Construction or arrangement of spraying pipes
D21F 1/345
. .
{
Spraying-pipe cleaners
}
Collapse
.
Guiding mechanisms (suction rolls D21F 3/10)
D21F 1/365
. .
{
for controlling the lateral position of the screen
}
D21F 1/38
. .
Pads
D21F 1/40
. .
Rolls
D21F 1/42
. .
Jets
Collapse
.
Watermarking devices
D21F 1/46
. .
Dandy rolls
Collapse
.
Suction apparatus (suction rolls D21F 3/10)
Collapse
D21F 1/483
. .
{
Drainage foils and bars
}
D21F 1/486
. . .
{
adjustable
}
D21F 1/50
. .
Suction boxes with rolls
Collapse
D21F 1/52
. .
Suction boxes without rolls
Collapse
D21F 1/523
. . .
{
Covers thereof
}
D21F 1/526
. . . .
{
consisting of endless moving belts
}
D21F 1/54
.
Skimming devices, e.g. froth ledges
.
Deckle frame arrangements
D21F 1/58
.
Deckle straps
D21F 1/60
.
Cylinder moulds
D21F 1/62
.
Sand traps
D21F 1/64
.
Magnetic separators
Collapse
.
Pulp catching, de-watering, or recovering; Re-use of pulp-water
D21F 1/68
. .
using hydrocyclones (hydrocyclones B04C)
. .
by flotation
D21F 1/72
. .
using funnels
Collapse
D21F 1/74
. .
using cylinders
D21F 1/76
. . .
with suction
D21F 1/78
. . .
with pressure
D21F 1/80
. .
using endless screening belts
D21F 1/82
. .
adding fibre agglomeration compositions
Transferring webs from wet ends to press sections
{
(handling webs in general B65H)
}
Collapse
Press section of machines for making continuous webs of paper
Collapse
D21F 3/02
.
Wet presses
Collapse
D21F 3/0209
. .
{
with extended press nip
}
Collapse
D21F 3/0218
. . .
{
Shoe presses
}
Collapse
. . . .
{
Belts or sleeves therefor
}
D21F 3/0236
. . . . .
{
manufacturing methods
}
D21F 3/0245
. . . . .
{
Means for fixing the sleeve to the roller end
}
Collapse
D21F 3/0254
. . .
{
Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers
}
D21F 3/0263
. . . .
{
Sealing arrangements therefor
}
D21F 3/0272
. .
{
in combination with suction or blowing devices
}
D21F 3/0281
. .
{
in combination with a dryer roll
}
D21F 3/029
. .
{
using special water-receiving belts
}
Collapse
. .
Arrangements thereof
D21F 3/045
. . .
{
including at least one extended press nip
}
D21F 3/06
. .
Means for regulating the pressure
Collapse
. .
Pressure rolls
D21F 3/083
. . .
{
perforated
}
D21F 3/086
. . .
{
having a grooved surface
}
Collapse
. .
Suction rolls, e.g. couch rolls
D21F 3/105
. . .
{
Covers thereof
}
Collapse
Dryer section of machines for making continuous webs of paper
Collapse
D21F 5/001
.
{
Drying webs by radiant heating
}
D21F 5/002
. .
{
from infra-red-emitting elements
}
D21F 5/003
. .
{
Shutter means
}
Collapse
.
{
Drying webs by contact with heated surfaces or materials
}
D21F 5/005
. .
{
in a fluid bed
}
D21F 5/006
.
{
Drying webs by using sonic vibrations
}
D21F 5/007
.
{
Drying webs by contact with sorbent bodies
}
D21F 5/008
.
{
Drying webs by direct contact with gas flames
}
D21F 5/009
.
{
Drying webs by centrifugal treatment
}
Collapse
.
Drying on cylinders
. .
{
Construction of the cylinders
}
Collapse
D21F 5/022
. .
{
Heating the cylinders
}
D21F 5/024
. . .
{
using electrical means
}
D21F 5/025
. . .
{
using combustion gases
}
D21F 5/027
. . .
{
using a heat-transfer fluid between the heating means and the cylinder shell
}
D21F 5/028
. . .
{
using steam
}
Collapse
D21F 5/04
. .
on two or more drying cylinders
Collapse
. . .
{
in combination with suction or blowing devices
}
D21F 5/044
. . . .
{
using air hoods over the cylinders
}
D21F 5/046
. . . .
{
using pocket ventilation systems
}
D21F 5/048
. . .
{
in combination with other heating means
}
D21F 5/06
. .
Regulating temperature
D21F 5/08
. .
Arrangement of steam points in the cylinders
D21F 5/10
. .
Removing condensate from the interior of the cylinders
.
Festoon drying
Collapse
D21F 5/14
.
Drying webs by applying vacuum
D21F 5/143
. .
{
through perforated cylinders
}
D21F 5/146
. .
{
Vacuum seals
}
Collapse
D21F 5/16
.
Drying webs by electrical heating
D21F 5/162
. .
{
Resistance heating
}
D21F 5/165
. .
{
Inductive heating; Capacitive heating
}
D21F 5/167
. .
{
Microwave heating
}
Collapse
.
Drying webs by hot air
D21F 5/181
. .
{
on Yankee cylinder
}
Collapse
D21F 5/182
. .
{
through perforated cylinders
}
D21F 5/184
. . .
{
Surfaces thereof
}
Collapse
D21F 5/185
. .
{
Supporting webs in hot air dryers
}
Collapse
D21F 5/187
. . .
{
by air jets
}
D21F 5/188
. . . .
{
Blowing devices
}
D21F 5/20
.
Waste heat recovery
Collapse
Other details of machines for making continuous webs of paper
D21F 7/001
.
{
Wire-changing arrangements
}
D21F 7/003
.
{
Indicating or regulating the moisture content of the layer
}
D21F 7/005
.
{
Wire-tensioning devices
}
D21F 7/006
.
{
Cutting the edges of the paper-web
}
.
{
Steam showers
}
D21F 7/02
.
Mechanical driving arrangements
D21F 7/04
.
Paper-break control devices
D21F 7/06
.
Indicating or regulating the thickness of the layer; Signal devices
Collapse
D21F 7/08
.
Felts
D21F 7/083
. .
{
Multi-layer felts
}
. .
{
Substantially impermeable for transferring fibrous webs
}
D21F 7/10
. .
Seams thereof
D21F 7/12
. .
Drying
Collapse
Complete machines for making continuous webs of paper
Collapse
D21F 9/003
.
{
of the twin-wire type
}
. .
{
paper or board consisting of two or more layers
}
D21F 9/02
.
of the Fourdrinier type
Collapse
D21F 9/04
.
of the cylinder type
D21F 9/043
. .
{
with immersed cylinder
}
D21F 9/046
. .
{
with non-immersed cylinder
}
Collapse
Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
D21F 11/002
.
{
by using a foamed suspension
}
D21F 11/004
.
{
by modification of the viscosity of the suspension
}
.
{
Making patterned paper
}
D21F 11/008
.
{
Making apertured paper
}
Collapse
D21F 11/02
.
of the Fourdrinier type
. .
paper or board consisting on two or more layers
Collapse
D21F 11/06
.
of the cylinder type
D21F 11/08
. .
paper or board consisting of two or more layers
D21F 11/10
.
Making imitation mould-made paper
D21F 11/12
.
Making corrugated paper or board
Collapse
.
Making cellulose wadding, filter or blotting paper
D21F 11/145
. .
{
including a through-drying process
}
D21F 11/16
.
Making paper strips for spinning or twisting
Collapse
Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production (making discontinuous sheets of board in moulds D21J; drying paper, pulpboard, or cardboard, in discontinuous sheet form F26B)
.
Making hand-made paper
Collapse
D21F 13/04
.
on cylinder board machines
Collapse
D21F 13/06
. .
Format rolls
D21F 13/08
. . .
Automatic cut-off rolls
Collapse
D21F 13/10
.
using board presses
D21F 13/12
. .
Platen presses
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013