B27K - Definition 
Definition statement
This subclass covers:
Methods and apparatus for the following treatments of wood:
- Dampening;
- Impregnating;
- Staining;
- Dyeing;
- Bleaching;
- Softening;
- Hardening.
Other methods and apparatus for treating of wood with permeant liquids, unless provided for in other subclasses.
Methods and apparatus for bleaching or impregnatingwood 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 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. 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 does not cover:
Bending of wood | B27H |
Impregnation of stoppers for bottles, jars, or similar containers | B67B 1/03 |
Impregnation of matches | C06F 1/06, C06F 3/04 |
Manufacture or after-treatment of articles made by dry processes from particles or fibres consisting of wood or other lignocellulosic or like organic material | B27N |
Debarking wood by chemical treatment | B27L 3/00 |
Impregnating fibreboard manufactured by wet processes | D21J 1/08 |
After-treatment, e.g. hardening, of fibreboard manufactured by wet processes | D21J 1/10 |
Informative references
Attention is drawn to the following places, which may be of interest for search:
Biocides, Pest repellants | A01N |
Fire-extinguishing compositions | A62D 1/00 |
Apparatus for applying liquids or other fluent materials to surfaces in general | B05C |
Processes for applying liquids or other fluent materials to surfaces in general | B05D |
Processes, other than flocking, specially adapted for applying liquids or other fluent materials to wood | B05D 7/06 |
Mechanical working of veneer or plywood | B27D |
Applying adhesives or glue to surfaces of wood to be joined | B27G 11/00 |
Mechanical working of cane or the like | B27J 1/00 |
Mechanical working of cork | B27J 5/00 |
Mechanical working of tree or plant material not otherwise provided for | B27J 7/00 |
Burning or charring of wood | B27M 1/06 |
Manufacture or reconditioning of specific semi-finished or finished articles of wood | B27M 3/00 |
Artistic painting or surface treatment | B44D |
Organic dyes; Mordants; Lakes | C09B |
Coating compositions, e.g. paints | C09D |
Woodstains | C09D 15/00 |
Water repellent coating compositions based on oils, fats or waxes | C09D 191/00 |
Drying-oils | C09F 5/00, C09F 7/00 |
Siccatives, i.e. compounds to be used as driers | C09F 9/00 |
Anti-oxidant compositions; Compositions inhibiting chemical change | C09K 15/00 |
Fireproofing materials | C09K 21/00 |
Impregnating materials for pulp | D21H 17/00, D21H 21/00 |
Protection of building elements, e.g. against pests or fire | E04B 1/62 |
Drying solid material in general | F26B |
Glossary of terms
In this subclass, the following terms or expressions are used with the meaning indicated:
| Wood | Natural whole wood, or wood-based products other than those made from fibres, for example plywood or laminated veneer lumber. |
| Impregnating | Incorporating a substance into the pores of a material by absorption, adsorption or penetration, for example by soaking the material in the substance or by treating the material with the substance under pressure. Impregnating can for example be done in order to protect a material against destructive outside influences, such as fungal decay, pests or water. |
| 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. |
| 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). |
| Dampening | Treating wood, for example with steam, in order to increase its water content. |
Synonyms and Keywords
In patent documents the following abbreviations are often used:
| LVL | Laminated veneer lumber |
| PSL | Parallel strand lumber |
| LSL | Laminated strand lumber |
| OSB | Oriented strand board |