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 filing trajectory.

386
US patents granted
B21
Parent CPC class
20
Active assignees
+16%
5-yr velocity

The verdict

Making Particular Metal Objects BY Rolling ranks #561 of 670 CPC technology areas - 386 US patents granted since 2015, with filing up 16% over five years.

#561
of 670 CPC technology areas
386
US patents granted, 2015–2025
Victaulic
leading assignee (14)
+16%
filing velocity, last 5 yrs
Top assignee: Victaulic Company (14 patents)

CPC subclass B21H - MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS - covers 386 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class B21 (MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL). See our CPC classification guide for how the system works.

The competitive landscape in B21H is shaped by 20 distinct companies actively filing in this space. Victaulic Company leads with 14 patents, followed by SMS Group Gmbh at 10 grants and BALL Corporation at 8.

Filing activity in B21H is up 16% over the past five years versus 2015-2019, a relatively steady filing pace. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is B21H innovation accelerating?

US utility-patent grants per year in B21H, 2015–2025 - recent five years are up 16% 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

About This Class

CPC subclass B21H belongs to class B21.

386 patents were granted in this class between 2015 and 2025.

20 companies actively patent in this space.

Classification System

Cooperative Patent Classification (CPC) is a hierarchical patent classification system used by the USPTO and EPO.

← All Technology Classes Technology Rankings →

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).

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 Valvetr…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).

Frequently Asked Questions

What is CPC class B21H?
CPC subclass B21H covers MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS. It belongs to CPC class B21 (MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL), with 386 US utility patents granted since 2015.
How many patents have been filed in B21H?
386 US utility patents were granted in CPC subclass B21H between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in B21H?
Victaulic Company leads B21H with 14 patents, making it the most active assignee in this technology area.
How is patent data for B21H collected?
Patent data comes from USPTO PatentsView, a public research dataset maintained by the United States Patent and Trademark Office. It covers all US granted utility patents and assigns CPC codes based on the technology described in each patent.
What is the difference between CPC class and subclass?
A CPC class (e.g., B21) is a broad technology category. Subclasses like B21H provide finer granularity within that category. PlainPatent organizes data at the subclass level (4-character codes) for the most useful view of technology domains.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial

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.