PlainPatent

CPC technology class · B21

B21H - Making Particular Metal Objects By Rolling

Making particular metal objects by rolling, e.g. screws, wheels, rings, barrels, balls. 386 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

386
US patents granted
#7/9
in B21
2.5%
B21 class share
+6%
5-yr velocity

The verdict

According to USPTO PatentsView, Making Particular Metal Objects By Rolling ranks #561 of 670 CPC technology areas - 386 US patents granted since 2015, with recorded grant volume up 6% over five years.

#561
of 670 CPC technology areas
386
US patents granted, 2015–2025
Victaulic
leading assignee (14)
+6%
grant velocity, last 5 yrs

How B21H's grant cadence moved

Between 2020–2024, B21H recorded 180 grants versus 170 in 2015–2019 (+6% equal-window velocity). Across complete years, output peaked in 2021 at 46 grants and bottomed in 2016 at 22 (+109% peak-over-trough). Lead assignee Victaulic Company holds 3.6% of the class ; the top three share 8.3%.

Leaderboard read

B21H concentration, lead at 3.6%

Victaulic Company leads this historical grant record at 3.6% of B21H - foreign corporation assignees hold 73% of class grants (95 of 131). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share
3.6%

14 of 386 grants

Top three share
8.3%

of the class's recorded grants

Lead over #2
4

more grants than SMS group GmbH

Where B21H sits inside B21

Among 9 subclasses in B21 (Mechanical Metal-working Without Essentially Removing MATERIAL; Punching Metal), B21H ranks #7 and holds 2.5% of the parent class's 15,472 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

B21D 7,309 B21B 1,895 B21C 1,874 B21J 1,805 B21K 1,246 B21F 817 B21G 86 B21L 54

Rising assignees active in B21H

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. #1 Ball Corporation 1.38x 29 → 40 company-wide · 8 in B21H
  2. #2 SMS group GmbH 1.12x 75 → 84 company-wide · 10 in B21H
  3. #3 Victaulic Company 0.68x 78 → 53 company-wide · 14 in B21H

B21H grants by year, peak 2021 (46)

US utility-patent grants per year in B21H, 2015–2025 - recent five years are up 6% versus 2015–2019.

1020304050 20152016201720182019202020212022202320242025 17

Who leads B21H?

The 12 most active assignees in Making Particular Metal Objects BY Rolling, e.g. Screws, Wheels, Rings, Barrels, Balls - wider bars mean more grants

patents

What this shows Victaulic is the most active filer in B21H, holding 14 of the 386 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 B21H
Rank Company Patents in B21H
#1 Victaulic Company 14
#2 SMS group GmbH 10
#3 Ball Corporation 8
#4 Hegenscheidt-mfd GmbH & Co. KG 4
#5 Physical Systems, Inc. 4
#6 Ernst Grob AG 4
#7 Wieland-werke AG 3
#8 Federal-mogul Valvetrain GMBH 3
#9 Hegenscheidt-MFD GmbH 3
#10 Darwin Precisions Corporation 2
#11 Sungwoo Hitech Co., Ltd. 2
#12 Nittan Valve Co., Ltd. 2
#13 Miba Sinter Austria GmbH 2
#14 Daiwa CAN Company 2
#15 Taiyuan University of Science and Technology 2
#16 Swep International AB 2
#17 Deflecto, LLC 2
#18 United States Steel Corporation 2
#19 Universal Can Corporation 2
#20 Topura Co., Ltd. 2

Footprint here vs. claim strategy

Each dot is a leading B21H 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 B21H assignees by class footprint. Bubble size = patents in B21H. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 010203040 051015 Patents in B21H Avg claims / patent (company-wide) VictaulicSms groupBallHegenscheidt-mfd & KgPhysical SystemsErnst GrobWieland-werkeFederal-mogul…Hegenscheidt-mfdDarwin PrecisionsSungwoo HitechNittan ValveMiba Sinter AustriaDaiwa Can
Top 14 B21H assignees by class footprint. Bubble size = patents in B21H. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Questions about B21H

Which company holds the most patents in B21H?
Victaulic Company leads B21H with 14 patents (3.6% of the subclass). By PatentsView assignee type, foreign corporations account for 73% of class grants.
Which B21H assignees grew fastest recently?
Among assignees with ≥5 grants in B21H, Ball Corporation shows the highest company-wide grant multiple (1.38x: 29 grants in 2019–2021 → 40 in 2022–2024) while holding 8 patents in this subclass. Growth is company-wide, not class-only.
How does B21H compare inside parent class B21?
Inside B21 (Mechanical Metal-working Without Essentially Removing MATERIAL; Punching Metal), B21H ranks #7 of 9 subclasses by grant volume and holds 2.5% of the parent class total. The largest sibling is B21D (7,309 grants).

What to do with this data

B21H in context - here's where to go next.

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

Methodology - B21H figures are USPTO PatentsView granted-utility totals for this subclass (386 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.