CPC technology class · B27

B27J - Mechanical Working Of Cane

Mechanical working of cane, cork, or similar materials. 32 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

32
US patents granted: #10/11
in B27: 0.8%
B27 class share: +233%
5-yr velocity

The verdict

According to USPTO PatentsView, Mechanical Working Of Cane ranks #649 of 670 CPC technology areas - 32 US patents granted since 2015, with recorded grant volume up 233% over five years.

#649
of 670 CPC technology areas: 32
US patents granted, 2015–2025: Nanjing Forestry University
leading assignee (3): +233%
grant velocity, last 5 yrs

How B27J's grant cadence moved

Between 2020–2024, B27J recorded 20 grants versus 6 in 2015–2019 (+233% equal-window velocity). Across complete years, output peaked in 2024 at 10 grants and bottomed in 2017 at 1 (+900% peak-over-trough). Lead assignee Nanjing Forestry University holds 9.4% of the class ; the top three share 21.9%.

Leaderboard read

B27J concentration, lead at 9.4%

Nanjing Forestry University leads this historical grant record at 9.4% of B27J - foreign corporation assignees hold 83% of class grants (10 of 12). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 9.4%
Top three share: 21.9%
Lead over #2: 1

Where B27J sits inside B27

Among 11 subclasses in B27 (Working OR Preserving Wood OR Similar MATERIAL; Nailing OR Stapling Machines IN General), B27J ranks #10 and holds 0.8% 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 B27K 387 B27M 306 B27F 238 B27C 208 B27D 200

B27J grants by year, peak 2024 (10)

US utility-patent grants per year in B27J, 2015–2025 - recent five years are up 233% versus 2015–2019.

Nanjing Forestry…

3
Vinventions Usa

2
Project Noah

2
Parric Ningbo…

1
International Centre…

1
Southwest Forestry…

1
Jm Industries Group

1
Crocodile Products

1

What this shows Nanjing Forestry… is the most active filer in B27J, holding 3 of the 32 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 B27J
Rank	Company	Patents in B27J
#1	Nanjing Forestry University	3
#2	Vinventions USA, LLC	2
#3	Project Noah, Inc.	2
#4	Parric Ningbo Stationary and Gifts Mfg. Co., Ltd.	1
#5	International Centre FOR Bamboo AND Rattan	1
#6	Southwest Forestry University	1
#7	JM Industries Group	1
#8	Crocodile Products Inc.	1

Footprint here vs. claim strategy

Each dot is a leading B27J 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 8 B27J assignees by class footprint. Bubble size = patents in B27J. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Questions about B27J

Which company holds the most patents in B27J?

Nanjing Forestry University leads B27J with 3 patents (9.4% of the subclass). By PatentsView assignee type, foreign corporations account for 83% of class grants.

How does B27J compare inside parent class B27?

Inside B27 (Working OR Preserving Wood OR Similar MATERIAL; Nailing OR Stapling Machines IN General), B27J ranks #10 of 11 subclasses by grant volume and holds 0.8% of the parent class total. The largest sibling is B27B (1,327 grants).

What to do with this data

B27J in context - here's where to go next.

Nanjing Forestry University leads B27J with 3 grants in this class. See full portfolio
B27J ranks #649 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 - B27J figures are USPTO PatentsView granted-utility totals for this subclass (32 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.