CPC technology class · B24

B24B - Machines

Machines, devices, or processes for grinding or polishing ; dressing or conditioning of abrading surfaces; feeding of grinding, polishing, or lapping agents. 6,402 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

6,402
US patents granted: #1/3
in B24: 66.4%
B24 class share: -3%
5-yr velocity

The verdict

According to USPTO PatentsView, Machines ranks #225 of 670 CPC technology areas - 6,402 US patents granted since 2015, with recorded grant volume down 3% over five years.

#225
of 670 CPC technology areas: 6,402
US patents granted, 2015–2025: Applied Materials
leading assignee (433): -3%
grant velocity, last 5 yrs

How B24B's grant cadence moved

Between 2020–2024, B24B recorded 2,791 grants versus 2,879 in 2015–2019 (-3% equal-window velocity). Across complete years, output peaked in 2019 at 640 grants and bottomed in 2021 at 466 (+37% peak-over-trough). Lead assignee Applied Materials, Inc. holds 6.8% of the class ; the top three share 17.4%.

Leaderboard read

B24B concentration, lead at 6.8%

Applied Materials, Inc. leads this historical grant record at 6.8% of B24B - foreign corporation assignees hold 67% of class grants (2,650 of 3,934). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 6.8%
Top three share: 17.4%
Lead over #2: 43

Where B24B sits inside B24

Among 3 subclasses in B24 (GRINDING; Polishing), B24B ranks #1 and holds 66.4% of the parent class's 9,639 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

B24D 2,145 B24C 1,092

Rising assignees active in B24B

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 SK Enpulse Co., Ltd. 20x 0 → 20 company-wide · 18 in B24B
#2 GrayMatter Robotics Inc. 14x 0 → 14 company-wide · 18 in B24B
#3 Jiangsu Kangrui New Material Technology Co., Ltd. 7.00x 1 → 7 company-wide · 6 in B24B
#4 JR Automation Technologies, LLC 5.50x 2 → 11 company-wide · 7 in B24B
#5 Wangs Alliance Corporation 5.06x 16 → 81 company-wide · 16 in B24B

B24B grants by year, peak 2019 (640)

US utility-patent grants per year in B24B, 2015–2025 - recent five years are down 3% versus 2015–2019.

Applied Materials

433
Ebara

390
Taiwan Semiconductor…

288
Disco

196
Makita

110
Rohm and Haas…

110
Black & Decker

94
Fujimi Incorporated

80
Citic Dicastal

72
Shin-etsu Handotai

66
Essilor International

56
Sumco

51

What this shows Applied Materials is the most active filer in B24B, holding 433 of the 6,402 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 B24B
Rank	Company	Patents in B24B
#1	Applied Materials, Inc.	433
#2	Ebara Corporation	390
#3	Taiwan Semiconductor Manufacturing Company Ltd.	288
#4	Disco Corporation	196
#5	Makita Corporation	110
#6	Rohm and Haas Electronic Materials CMP Holdings, Inc.	110
#7	Black & Decker Inc.	94
#8	Fujimi Incorporated	80
#9	Citic Dicastal Co., Ltd.	72
#10	Shin-etsu Handotai Co., Ltd.	66
#11	Essilor International	56
#12	Sumco Corporation	51
#13	Cabot Microelectronics Corporation	50
#14	Hoya Corporation	44
#15	Seagate Technology LLC	43
#16	Saint-gobain Abrasives, Inc.	42
#17	Saint-gobain Abrasifs	41
#18	Nanjing Chervon Industry Co., Ltd.	34
#19	Essilor International (Compagnie Generale d'Optique)	34
#20	C. & E. Fein GMBH	31

Footprint here vs. claim strategy

Each dot is a leading B24B 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 B24B assignees by class footprint. Bubble size = patents in B24B. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near B24B's 6,402-grant footprint

Nationwide nearest neighbors for B24B (#225 of 670 by volume ; lead share 6.8%) - not the B24 parent-class siblings above.

Nearest by grant volume

G08C 6,426 B41M 6,377 C07H 6,464 H02S 6,483

Nearest by lead-assignee share

B61H 6.8% G01Q 6.7% F23Q 6.8% A23D 6.7%

Questions about B24B

Which company holds the most patents in B24B?

Applied Materials, Inc. leads B24B with 433 patents (6.8% of the subclass). By PatentsView assignee type, foreign corporations account for 67% of class grants.

Which B24B assignees grew fastest recently?

Among assignees with ≥5 grants in B24B, SK Enpulse Co., Ltd. shows the highest company-wide grant multiple (20x: 0 grants in 2019–2021 → 20 in 2022–2024) while holding 18 patents in this subclass. Growth is company-wide, not class-only.

How does B24B compare inside parent class B24?

Inside B24 (GRINDING; Polishing), B24B ranks #1 of 3 subclasses by grant volume and holds 66.4% of the parent class total. The largest sibling is B24D (2,145 grants).

What to do with this data

B24B in context - here's where to go next.

Applied Materials, Inc. leads B24B with 433 grants in this class. See full portfolio
B24B ranks #225 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class B24, the largest sibling subclass is B24D with 2,145 grants. Explore B24D

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

Methodology - B24B figures are USPTO PatentsView granted-utility totals for this subclass (6,402 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.