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 grant trajectory.

Compiled by PlainPatent · May 15, 2026

387
US patents granted: #4/11
in B27: 9.3%
B27 class share: +1%
5-yr velocity

The verdict

According to USPTO PatentsView, Processes ranks #560 of 670 CPC technology areas - 387 US patents granted since 2015, with recorded grant volume up 1% over five years.

#560
of 670 CPC technology areas: 387
US patents granted, 2015–2025: Koppers Performance…
leading assignee (19): +1%
grant velocity, last 5 yrs

How B27K's grant cadence moved

Between 2020–2024, B27K recorded 173 grants versus 171 in 2015–2019 (+1% equal-window velocity). Across complete years, output peaked in 2019 at 52 grants and bottomed in 2017 at 26 (+100% peak-over-trough). Lead assignee Koppers Performance Chemicals, Inc. holds 4.9% of the class ; the top three share 9.6%.

Leaderboard read

B27K concentration, lead at 4.9%

Koppers Performance Chemicals, Inc. leads this historical grant record at 4.9% of B27K - us corporation assignees hold 53% of class grants (70 of 133). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 4.9%
Top three share: 9.6%
Lead over #2: 9

Where B27K sits inside B27

Among 11 subclasses in B27 (Working OR Preserving Wood OR Similar MATERIAL; Nailing OR Stapling Machines IN General), B27K ranks #4 and holds 9.3% of the parent class's 4,149 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

B27B 1,327 B27N 750 B27G 503 B27M 306 B27F 238 B27C 208 B27D 200 B27L 168

Rising assignees active in B27K

Company-wide grant multiples (2022–2024 vs 2019–2021) among assignees with ≥5 patents in this subclass. Growth is company-wide; class patent counts are subclass-specific.

#1 Kop-coat, Inc. 1.00x 4 → 4 company-wide · 5 in B27K
#2 Tricoya Technologies Ltd 0.83x 6 → 5 company-wide · 10 in B27K
#3 Swiss Krono Tec AG 0.65x 17 → 11 company-wide · 6 in B27K
#4 Titan Wood Limited 0.33x 3 → 1 company-wide · 7 in B27K
#5 Koppers Performance Chemicals, Inc. 0.29x 7 → 2 company-wide · 19 in B27K

B27K grants by year, peak 2019 (52)

US utility-patent grants per year in B27K, 2015–2025 - recent five years are up 1% versus 2015–2019.

Koppers Performance…

19
Tricoya

10
Osmose Utilities…

8
Titan Wood

7
Swiss Krono Tec

6
Kop-coat

5
M-fire Supression

5
Flooring

4
Woodpeckers

3
Nanjing Forestry…

3
Arxada

3
Boise Cascade

3

What this shows Koppers Performance… 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.

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

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).

Questions about B27K

Which company holds the most patents in B27K?

Koppers Performance Chemicals, Inc. leads B27K with 19 patents (4.9% of the subclass). By PatentsView assignee type, us corporations account for 53% of class grants.

Which B27K assignees grew fastest recently?

Among assignees with ≥5 grants in B27K, Kop-coat, Inc. shows the highest company-wide grant multiple (1.00x: 4 grants in 2019–2021 → 4 in 2022–2024) while holding 5 patents in this subclass. Growth is company-wide, not class-only.

How does B27K compare inside parent class B27?

Inside B27 (Working OR Preserving Wood OR Similar MATERIAL; Nailing OR Stapling Machines IN General), B27K ranks #4 of 11 subclasses by grant volume and holds 9.3% of the parent class total. The largest sibling is B27B (1,327 grants).

What to do with this data

B27K in context - here's where to go next.

Koppers Performance Chemicals, Inc. leads B27K with 19 grants in this class. See full portfolio
B27K ranks #560 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class B27, the largest sibling subclass is B27B with 1,327 grants. Explore B27B

Figures reflect USPTO PatentsView grant data through 2026-05-15; pending applications not yet granted are not counted.

Methodology - B27K figures are USPTO PatentsView granted-utility totals for this subclass (387 grants in the tracked window).

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.