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PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
Definition statement
This subclass/group covers:

Methods and apparatus for the following treatments of wood:

  • Dampening;
  • Impregnating;
  • Staining;
  • Dyeing;
  • Bleaching;
  • Softening;
  • Hardening; and
  • other methods and apparatus for treating of wood with permeant liquids, unless provided for in other subclasses.

Methods and apparatus for bleaching or impregnating wood in combination with drying;

Methods and apparatus for chemical or physical treatment of cork;

Methods and apparatus for chemical or physical treatment of cane, reed, straw, bamboo or similar fibrous material of plant origin;

Selection (i.e. use) of chemical substances for the treatments covered by this subclass, unless provided for in other subclasses.

Relationship between large subject matter areas

This subclass covers the selection of chemical substances, i.e. the use thereof, for the treatments covered by the subclass. Substances or compositions per-se are not covered by this subclass.

The structure or composition of the chemical substances selected is covered by pure chemistry classes C01, C07, or C08. Special activities or special properties of the chemical substances selected are covered in places for these activities or properties, for example in A01N (biocides), A62D 1/00 (fire extinguishing compositions), C09B (dyes), C09D (stains) or C09K (anti-oxidant compositions or fireproofing materials).

References relevant to classification in this subclass
This subclass/group does not cover:
Biocidal compositions
Fire-extinguishing compositions
Coating wood
Planing, drilling, milling, or turning wood
Mechanical working of veneer or plywood
Applying adhesives or glue to surfaces of wood to be joined
Bending wood
Mechanical working of cane, cork, or of tree or plant material not otherwise provided for
Debarking, splitting wood, manufacture of veneer, wooden sticks, wood shavings, chips, powder, or the like
Compressing, punching out, burning or charring wood
Manufacture or reconditioning of specific semi-finished or finished wood articles
Manufacture of articles made by dry processes from particles or fibres consisting of wood or other lignocellulosic or like organic material; after-treatment of these articles
Impregnation of stoppers for bottles, jars, or similar containers
Impregnation of matches
Water repellent compositions of oils, fats or waxes or of derivatives thereof
Woodstains
Drying-oils, siccatives
Fireproofing materials
Paper-pulp impregnation
Impregnation and after-treatment of fibreboard manufactured by wet processes
Protection of building elements, e.g. against pests or fire
Drying solid materials
Treatment of materials for manufacturing musical instruments
Informative references
Attention is drawn to the following places, which may be of interest for search:
Apparatus for applying liquids or other fluent materials to surfaces
Multilayer materials (essentially comprising wood B32B 21/00; impregnation, colouring B32B 38/00)
Artistic painting or surface treatment
Compositions inhibiting chemical change, e.g. of antioxidants
Building materials, also made of wood
Roof coverings, also made of wood
Flooring made of wood
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Dampening
Treating wood for increasing its water content (e.g. by steaming)
Dyeing
Treating a material with a soluble colouring substance that has an affinity to the material to which it is applied (as opposed to colouring with a pigment, which is usually insoluble)
Impregnation
Incorporation of a substance into the pores of a material by absorption, adsorption or penetration
OSB
Oriented strand board
Staining
Treating a surface with a paint that is formulated to transport the pigment into the pores of the surface, rather than creating a film on top of the surface
Thermal treatment
Treatment of wood at temperatures well over 100°C allowing for the modification of its chemical structure
Wood
Natural whole wood, or wood-based products other than those made from fibres or particles, for example plywood or laminated veneer lumber
Damping wood
Definition statement
This subclass/group covers:

Methods and apparatus for increasing the water content of the wood. The main purpose of such treatments is to prevent cracking of wood by overdrying.

Relationship between large subject matter areas

Steam drying of wood is covered by B26F.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Dampening or damping
Humidifying, moistening
Impregnating wood, [N: e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process] (dyeing, staining B27K 5/00)
Definition statement
This subclass/group covers:

Methods and apparatus for impregnating wood and for pre- and after-treatments related to wood impregnation.

References relevant to classification in this group
This subclass/group does not cover:
Biocides, Pest repellants
Fire-extinguishing compositions
Coating wood
Manufacture of articles made by dry processes from particles or fibres consisting of wood or other lignocellulosic or like organic material; after-treatment of these articles
Impregnation of stoppers for bottles, jars, or similar containers
Impregnation of matches
Water repellent compositions of oils, fats or waxes or of derivatives thereof
Woodstains
Drying-oils
Siccatives
Fireproofing materials
Paper-pulp impregnation
Impregnation and after-treatment of fibreboard manufactured by wet processes
Protection of building elements, e.g. against pests or fire
Treatment of materials for manufacturing musical instruments
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Active component
A component of an impregnation mixture which is essential for the purpose of the impregnation. Solvents, surfactants, thickeners, and the like are normally not falling within this definition
[N: employing compositions comprising micro-organisms]
Relationship between large subject matter areas

Compositions employing micro-organisms are covered by C12N. Processes using micro-organisms in general are covered by C12R, apparatus thereof by C12M, measuring and testing by C12Q.

[N: employing compositions comprising microparticles]
Relationship between large subject matter areas

Biocidal compositions characterised by their form are covered by A01N 25/00.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Microparticles
Particles with diameters between 0.1-100 microns
[N: employing compositions comprising nanoparticles]
Relationship between large subject matter areas

Biocidal compositions characterised by their form are covered by A01N 25/00.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Nanoparticles
particles with diameters between 1-100 nm
[N: Pore opening (B27K 3/0214 takes precedence)]
Definition statement
This subclass/group covers:

Pre-treatments aimed to open the wood pores, excepting drying.

[N: using melt impregnation]
Definition statement
This subclass/group covers:

Impregnation processes employing melted solids.

[N: using staples or nails]
Definition statement
This subclass/group covers:

Impregnation processes employing staples or nails made of materials with biocidal properties.

[N: Vapour phase impregnation]
Definition statement
This subclass/group covers:

Impregnation processes employing biocides in vapour phase.

[N: for improving fixation (B27K 3/0285 takes precedence)]
Special rules of classification within this subgroup

Polymer impregnation for improving the fixation of an impregnation agent should be not classified here, but only in B27K 3/15 and/or its subgroups.

[N: along the fibers, i.e. longitudinal impregnation]
Definition statement
This subclass/group covers:

Impregnation processes employing a pressure gradient along the wood fibres.

Bandage methods
Definition statement
This subclass/group covers:

Impregnation processes employing a bandage for storing and releasing the impregnation agent.

Impregnating involving polymerisation [N: including use of polymer-containing impregnating agents (macromolecular compounds derived from lignocellulosic materials C08H; compositions of lignin-containing materials C08L 97/02)]
Definition statement
This subclass/group covers:

Impregnation processes involving the use of polymerized or polycondensed substances.

Relationship between large subject matter areas

Macromolecular compounds derived from lignocellulosic materials are covered by C08H. Compositions of lignocellulosic containing materials are covered by C08L 97/02.

Special rules of classification within this group

The documents of this head group are classified additionally in M08L and M08K for information regarding the chemical nature of the polymer composition employed in impregnation.

[N: Without in-situ polymerisation, condensation, or cross-linking reactions]
Definition statement
This subclass/group covers:

Impregnation processes involving substances polymerized or polycondensed before impregnation.

Special rules of classification within this subgroup

The documents of this subgroup are classified additionally in M08L and M08K for information regarding the chemical nature of the polymer composition employed in impregnation.

[N: Combined with grafting onto wood fibres]
Definition statement
This subclass/group covers:

Impregnation processes involving the use of polymerized or polycondensed substances which react with the chemical structure of wood.

Special rules of classification within this subgroup

The documents of this subgroup are classified additionally in M08L and M08K for information regarding the chemical nature of the polymer composition employed in impregnation.

Inorganic impregnating agents
Relationship between large subject matter areas

Inorganic biocidal compositions are covered by A01N.

Special rules of classification within this group

This head group covers impregnation processes involving the use of inorganic substances either not covered by the subgroups B27K 3/163 to B27K 3/32, or when their chemical nature is not especially relevant.

This head group and its subgroups B27K 3/163 to B27K 3/30 refer only to the active components of the impregnation mixtures.

Mixtures of different inorganic impregnating agents
Special rules of classification within this group

This subgroup covers impregnation processes characterized by the presence of a synergistic effect caused by at least two active inorganic components. The active inorganic components should be classified in their specific subgroups B27K 3/163 to B27K 3/30, too.

Organic impregnating agents [N: (polymers B27K 3/15)]
Relationship between large subject matter areas

Organic biocidal compositions are covered by A01N.

Special rules of classification within this group

This head group covers impregnation processes involving the use of organic substances either not covered by the subgroups B27K 3/343 to B27K 3/48, or when their chemical nature is not especially relevant.

This head group and its subgroups B27K 3/343 to B27K 3/48 refer only to the active components of the impregnation mixtures.

[N: Grafting onto wood fibres (B27K 3/156 takes precedence; macromolecular compounds derived from lignocellulosic materials C08H)]
Definition statement
This subclass/group covers:

Impregnation processes involving the use of organic substances which react with the chemical structure of wood.

Mixtures of different organic impregnating agents
Special rules of classification within this group

This subgroup covers impregnation processes characterized by the presence of a synergistic effect caused by at least two active organic components. The active organic components should be classified in their specific subgroups B27K 3/343 to B27K 3/48, too.

Impregnating agents containing mixtures of inorganic and organic compounds
Special rules of classification within this group

This subgroup covers impregnation processes characterized by the presence of a synergistic effect caused by at least one inorganic and at least one organic component. The active components should be classified in their specific subgroups B27K 3/163 to B27K 3/30 and B27K 3/343 to B27K 3/48, respectively, too.

Treating of wood not provided for in groups B27K 1/00, B27K 3/00
References relevant to classification in this group
This subclass/group does not cover:
Coating wood
Planing, drilling, milling, or turning wood
Mechanical working of veneer or plywood
Applying adhesives or glue to surfaces of wood to be joined
Bending wood
Mechanical working of cane, cork, or of tree or plant material not otherwise provided for
Debarking, splitting wood, manufacture of veneer, wooden sticks, wood shavings, chips, powder, or the like
Compressing, punching out, burning or charring wood
Manufacture or reconditioning of specific semi-finished or finished wood articles
Manufacture of articles made by dry processes from particles or fibres consisting of wood or other lignocellulosic or like organic material; after-treatment of these articles
Woodstains
Drying solid materials
Treatment of materials for manufacturing musical instruments
Combined bleaching or impregnating and drying of wood
Special rules of classification within this group

Pre-drying before impregnation is covered by B27K 3/0214. The polymerizing, condensation, or cross-linking of the impregnating compositions comprising monomers or polymers is normally not covered by this group.

Softening or hardening of wood
Special rules of classification within this group

Processes inherently leading to softening or hardening, like dampening, polymer impregnation, or thermal treatment are classified here only in connection with a special effect.

Chemical or physical treatment of cork (mechanical working of cork B27J 5/00)
References relevant to classification in this group
This subclass/group does not cover:
Mechanical working of cane, cork, or of tree or plant material not otherwise provided for
Impregnation of stoppers for bottles, jars, or similar containers
Drying solid materials
Special rules of classification within this group

Documents of this head group may be classified in B27K 1/00-B27K 5/06 for additional information.

Chemical or physical treatment of reed, straw, or similar material (mechanical working of cane or the like B27J 1/00)
References relevant to classification in this group
This subclass/group does not cover:
Mechanical working of cane, cork, or of tree or plant material not otherwise provided for
Protection of building elements, e.g. against pests or fire
Drying solid materials
Special rules of classification within this group

Documents of this head group may be classified in B27K 1/00-B27K 5/06 for additional information.

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Last Modified: 10/11/2013