CPC technology class · B24

B24D - Tools For Grinding

Tools for grinding, buffing or sharpening. 2,145 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

2,145
US patents granted: #2/3
in B24: 22.3%
B24 class share: -37%
5-yr velocity

The verdict

According to USPTO PatentsView, Tools For Grinding ranks #361 of 670 CPC technology areas - 2,145 US patents granted since 2015, with recorded grant volume down 37% over five years.

#361
of 670 CPC technology areas: 2,145
US patents granted, 2015–2025: 3m Innovative Properties
leading assignee (204): -37%
grant velocity, last 5 yrs

How B24D's grant cadence moved

Between 2020–2024, B24D recorded 687 grants versus 1,094 in 2015–2019 (-37% equal-window velocity). Across complete years, output peaked in 2019 at 236 grants and bottomed in 2022 at 127 (+86% peak-over-trough). Lead assignee Saint-gobain Abrasives, Inc. holds 8.0% of the class ; the top three share 23.3%.

Leaderboard read

B24D concentration, lead at 8.0%

Saint-gobain Abrasives, Inc. leads this historical grant record at 8.0% of B24D - us corporation assignees hold 63% of class grants (805 of 1,269). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 8.0%
Top three share: 23.3%
Lead over #2: 5

Where B24D sits inside B24

Among 3 subclasses in B24 (GRINDING; Polishing), B24D ranks #2 and holds 22.3% 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.

B24B 6,402 B24C 1,092

Rising assignees active in B24D

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 · 11 in B24D
#2 Mirka Ltd 5.00x 3 → 15 company-wide · 8 in B24D
#3 Osborn, LLC 5.00x 1 → 5 company-wide · 5 in B24D
#4 Darex, LLC 3.00x 10 → 30 company-wide · 14 in B24D
#5 Edgecraft Corporation 2.00x 1 → 2 company-wide · 5 in B24D

B24D grants by year, peak 2019 (236)

US utility-patent grants per year in B24D, 2015–2025 - recent five years are down 37% versus 2015–2019.

Saint-gobain Abrasives

172
Saint-gobain Abrasifs

167
Us Synthetic

161
Baker Hughes Holdings

124
Smith International

41
Diamond Innovations

39
Rohm and Haas…

30
Element Six

28
Disco

27
Saint-gobain Ceramics…

26
Baker Hughes a Ge

25
Element Six Abrasives

18

What this shows 3m Innovative… is the most active filer in B24D, holding 204 of the 2,145 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 B24D
Rank	Company	Patents in B24D
#1	Saint-gobain Abrasives, Inc.	172
#2	Saint-gobain Abrasifs	167
#3	US Synthetic Corporation	161
#4	Baker Hughes Holdings LLC	124
#5	Smith International, Inc.	41
#6	Diamond Innovations, Inc.	39
#7	Rohm and Haas Electronic Materials CMP Holdings, Inc.	30
#8	Element Six Limited	28
#9	Disco Corporation	27
#10	Saint-gobain Ceramics & Plastics, Inc.	26
#11	Baker Hughes, a GE company, LLC	25
#12	Element SIX Abrasives S.A.	18
#13	Darex, LLC	14
#14	NexPlanar Corporation	14
#15	SK Enpulse Co., Ltd.	11
#16	Taimei Chemicals Co., Ltd.	11
#17	Xebec Technology Co., Ltd.	11
#18	Kinik Company	10
#19	National Oilwell DHT, L.P.	9
#20	IV Technologies Co., Ltd	9

Footprint here vs. claim strategy

Each dot is a leading B24D 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 B24D assignees by class footprint. Bubble size = patents in B24D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near B24D's 2,145-grant footprint

Nationwide nearest neighbors for B24D (#361 of 670 by volume ; lead share 9.5%) - not the B24 parent-class siblings above.

Nearest by grant volume

D03D 2,141 A44B 2,161 F27B 2,129 G09C 2,112

Nearest by lead-assignee share

G10D 9.5% F24C 9.6% B60N 9.4% B64B 9.6%

Questions about B24D

Which company holds the most patents in B24D?

3M Innovative Properties Company leads B24D with 204 patents (8.0% of the subclass). By PatentsView assignee type, us corporations account for 63% of class grants.

Which B24D assignees grew fastest recently?

Among assignees with ≥5 grants in B24D, SK Enpulse Co., Ltd. shows the highest company-wide grant multiple (20x: 0 grants in 2019–2021 → 20 in 2022–2024) while holding 11 patents in this subclass. Growth is company-wide, not class-only.

How does B24D compare inside parent class B24?

Inside B24 (GRINDING; Polishing), B24D ranks #2 of 3 subclasses by grant volume and holds 22.3% of the parent class total. The largest sibling is B24B (6,402 grants).

What to do with this data

B24D in context - here's where to go next.

Saint-gobain Abrasives, Inc. leads B24D with 172 grants in this class. See full portfolio
B24D ranks #361 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class B24, the largest sibling subclass is B24B with 6,402 grants. Explore B24B

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

Methodology - B24D figures are USPTO PatentsView granted-utility totals for this subclass (2,145 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.