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 (applying liquids or other fluent materials to surfaces in general B05; coating wood or similar material B44D); CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS

Introduced: September 1968

Description

B27K covers processes, apparatus, and chemical or physical treatment substances for impregnating, staining, dyeing, or bleaching wood and related fibrous materials (cork, cane, reed, straw). This includes methods and equipment for applying permeant liquids to wood that are not covered by more specific subclasses, such as preservative treatments, colorization processes, and surface modifications using chemical or physical means. The classification encompasses both the treatment procedures and the selection or formulation of substances used in these operations, excluding treatments already classified under dedicated preservation or specialized wood-working processes.

Title

Titles differ between systems:

IPC: PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING OR BLEACHING OF WOOD, OR FOR TREATING OF WOOD WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS

CPC: 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 (applying liquids or other fluent materials to surfaces in general B05; coating wood or similar material B44D); CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS

Full Title

Full titles differ between systems:

IPC:

PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING OR BLEACHING OF WOOD, OR FOR TREATING OF WOOD WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS

CPC:

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 (applying liquids or other fluent materials to surfaces in general B05; coating wood or similar material B44D); CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS

Additional Content IPC

Glossary

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.

Limiting references

Bending of wood Impregnation of stoppers for bottles, jars or similar containers Impregnation of matches ,

Of 7 combined children, 5 exist in both systems.

2 codes are CPC-only extensions.

Note: 2 CPC extensions are marked as secondary classification only.

5 shared codes have differing titles between IPC and CPC.

Child Classifications

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B27K 1/00 Damping wood IPC+CPC Available in IPC and CPC
B27K 2200/00 Wooden materials to be treated 2nd only +3 CPC CPC only CPC only
B27K 2240/00 Purpose of the treatment 2nd only +8 CPC CPC only CPC only
B27K 3/00 Impregnating wood, (dyeing, staining B27K5/00) +3 CPC IPC+CPC Available in IPC and CPC
B27K 5/00 Treating of wood not provided for in groups B27K1/00, B27K3/00 +8 CPC IPC+CPC Available in IPC and CPC
B27K 7/00 Chemical or physical treatment of cork (mechanical working of cork B27J5/00) IPC+CPC Available in IPC and CPC
B27K 9/00 Chemical or physical treatment of reed, straw, or similar material (mechanical working of cane or the like B27J1/00) +3 CPC IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class B27,2013–2023, worldwide · Source: EPO PATSTAT

NANJING FORESTRY UNIVERSITY 960
ROBERT BOSCH DE 762
HOMAG DE 384
HARBIN ARTS AND CRAFTS COMPANY 350
NORTHEAST FORESTRY UNIVERSITY 343
SWISS KRONO TEC CH 304
MAKITA CORPORATION 298
DIEFFENBACHERMASCHINEN- UND ANLAGENBAU DE 296
VAELINGE INNOVATION SE 287
HUSQVARNA SE 282

Top Applicants (CPC)

Class B27,2013–2023, worldwide · Source: EPO PATSTAT

ROBERT BOSCH DE 868
NANJING FORESTRY UNIVERSITY 463
HOMAG DE 437
HUSQVARNA SE 360
SWISS KRONO TEC CH 350
MAKITA CORPORATION JP 319
DIEFFENBACHERMASCHINEN- UND ANLAGENBAU DE 312
VAELINGE INNOVATION SE 306
ANDREAS STIHL & COMPANY DE 275
FESTOOL DE 260