PlainPatent

CPC technology class · B27

B27K - Processes

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. 387 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

387
US patents granted
B27
Parent CPC class
20
Active assignees
+17%
5-yr velocity

The verdict

Processes ranks #560 of 670 CPC technology areas - 387 US patents granted since 2015, with filing up 17% over five years.

#560
of 670 CPC technology areas
387
US patents granted, 2015–2025
Koppers Performance C…
leading assignee (19)
+17%
filing velocity, last 5 yrs
Top assignee: Koppers Performance Chemicals, Inc. (19 patents)

CPC subclass B27K - 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 - covers 387 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class B27 (WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL). See our CPC classification guide for how the system works.

The competitive landscape in B27K is shaped by 20 distinct companies actively filing in this space. Koppers Performance Chemicals, Inc. leads with 19 patents, followed by Tricoya Technologies Ltd at 10 grants and Osmose Utilities Services, Inc. at 8.

Filing activity in B27K is up 17% over the past five years versus 2015-2019, a relatively steady filing pace. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is B27K innovation accelerating?

US utility-patent grants per year in B27K, 2015–2025 - recent five years are up 17% versus 2015–2019.

2030405060 20152016201720182019202020212022202320242025 27

Who leads B27K?

The 12 most active assignees in 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 - wider bars mean more grants

patents

What this shows Koppers Performance C… is the most active filer in B27K, holding 19 of the 387 patents in this class. Concentration at the top signals how contestable this technology area is for new entrants.

Source USPTO PatentsView, granted utility patents As of 2015–2025 grant years
View data table
Top patent holders in CPC subclass B27K
Rank Company Patents in B27K
#1 Koppers Performance Chemicals, Inc. 19
#2 Tricoya Technologies Ltd 10
#3 Osmose Utilities Services, Inc. 8
#4 Titan WOOD Limited 7
#5 Swiss Krono Tec Ag 6
#6 Kop-coat, Inc. 5
#7 M-fire Supression, Inc. 5
#8 Flooring Technologies Ltd. 4
#9 Woodpeckers, Llc 3
#10 Nanjing Forestry University 3
#11 Arxada, Llc 3
#12 Boise Cascade Company 3
#13 IML Instrumenta Mechanik Labor Gmbh 3
#14 Jeld-wen, Inc. 2
#15 ITT Italia S.r.l. 2
#16 Louisiana-pacific Corp. 2
#17 D'addario & Company, Inc. 2
#18 Siempelkamp Maschinen- Und Anlagenbau Gmbh 2
#19 Rhodia Acetow Gmbh 2
#20 Guangdong Huarun Paints Co., Ltd 2

About This Class

CPC subclass B27K belongs to class B27.

387 patents were granted in this class between 2015 and 2025.

20 companies actively patent in this space.

Classification System

Cooperative Patent Classification (CPC) is a hierarchical patent classification system used by the USPTO and EPO.

← All Technology Classes Technology Rankings →

Footprint here vs. claim strategy

Each dot is a leading B27K assignee, placed by how many patents it holds in this class (horizontal) against its company-wide average claims per patent (vertical) - a read on whether the class is led by broad-but-shallow filers or focused deep-claim players.

Top 14 B27K assignees by class footprint. Bubble size = patents in B27K. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 B27K assignees by class footprint. Bubble size = patents in B27K. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 010203040 05101520 Patents in B27K Avg claims / patent (company-wide) Koppers Performance C…TricoyaOsmose Utilities Serv…Titan WoodSwiss Krono TecKop-coatM-fire SupressionFlooringWoodpeckersNanjing Forestry Univ…ArxadaBoise CascadeIml Instrumenta Mecha…Jeld-wen
Top 14 B27K assignees by class footprint. Bubble size = patents in B27K. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class B27K?
CPC subclass B27K covers 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. It belongs to CPC class B27 (WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL), with 387 US utility patents granted since 2015.
How many patents have been filed in B27K?
387 US utility patents were granted in CPC subclass B27K between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in B27K?
Koppers Performance Chemicals, Inc. leads B27K with 19 patents, making it the most active assignee in this technology area.
How is patent data for B27K collected?
Patent data comes from USPTO PatentsView, a public research dataset maintained by the United States Patent and Trademark Office. It covers all US granted utility patents and assigns CPC codes based on the technology described in each patent.
What is the difference between CPC class and subclass?
A CPC class (e.g., B27) is a broad technology category. Subclasses like B27K provide finer granularity within that category. PlainPatent organizes data at the subclass level (4-character codes) for the most useful view of technology domains.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial

Every figure on PlainPatent is rendered directly from USPTO source data, no number is typed in by an editor. This page draws directly on USPTO source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.