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CPC technology class · H01

H01F - Magnets

Magnets; inductances; transformers; selection of materials for their magnetic properties. 21,711 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

21,711
US patents granted
H01
Parent CPC class
20
Active assignees
+36%
5-yr velocity

The verdict

Magnets ranks #93 of 670 CPC technology areas - 21,711 US patents granted since 2015, with filing up 36% over five years.

#93
of 670 CPC technology areas
21,711
US patents granted, 2015–2025
Murata Manufacturing
leading assignee (1,164)
+36%
filing velocity, last 5 yrs
Top assignee: Murata Manufacturing Co., Ltd. (1,164 patents)

CPC subclass H01F - MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - covers 21,711 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class H01 (ELECTRIC ELEMENTS). See our CPC classification guide for how the system works.

The competitive landscape in H01F is shaped by 20 distinct companies actively filing in this space. Murata Manufacturing Co., Ltd. leads with 1,164 patents, followed by TDK Corporation at 904 grants and Taiwan Semiconductor Manufacturing Company Ltd. at 281.

Filing activity in H01F is up 36% over the past five years versus 2015-2019, a sharp acceleration suggesting an emerging or fast-moving technology area. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is H01F innovation accelerating?

US utility-patent grants per year in H01F, 2015–2025 - recent five years are up 36% versus 2015–2019.

1,0001,5002,0002,500 20152016201720182019202020212022202320242025 1,425

Who leads H01F?

The 12 most active assignees in MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - wider bars mean more grants

patents

What this shows Murata Manufacturing is the most active filer in H01F, holding 1,164 of the 21,711 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 H01F
Rank Company Patents in H01F
#1 Murata Manufacturing Co., Ltd. 1,164
#2 TDK Corporation 904
#3 Taiwan Semiconductor Manufacturing Company Ltd. 281
#4 Hitachi, Ltd. 234
#5 Taiyo Yuden Co., Ltd. 223
#6 JFE Steel Corporation 209
#7 Sumitomo Electric Industries, Ltd. 171
#8 Nippon Steel Corporation 167
#9 LG Innotek Co., Ltd. 158
#10 Sumitomo Wiring Systems, Ltd. 119
#11 Autonetworks Technologies, Ltd. 116
#12 ABB Schweiz Ag 115
#13 Delta Electronics (shanghai) Co., Ltd. 111
#14 Realtek Semiconductor Corp. 110
#15 Witricity Corporation 107
#16 Nucurrent, Inc. 103
#17 Delta Electronics, Inc. 100
#18 Cyntec Co., Ltd. 99
#19 Sumida Corporation 76
#20 Siemens Healthcare Limited 64

About This Class

CPC subclass H01F belongs to class H01.

21,711 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 H01F 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 H01F assignees by class footprint. Bubble size = patents in H01F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 H01F assignees by class footprint. Bubble size = patents in H01F. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 510152025 050010001500 Patents in H01F Avg claims / patent (company-wide) Murata ManufacturingTdkTaiwan Semiconductor…HitachiTaiyo YudenJfe SteelSumitomo Electric Ind…Nippon SteelLg InnotekSumitomo Wiring Syste…AutonetworksAbb SchweizDelta (Shanghai)Realtek Semiconductor
Top 14 H01F assignees by class footprint. Bubble size = patents in H01F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class H01F?
CPC subclass H01F covers MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES. It belongs to CPC class H01 (ELECTRIC ELEMENTS), with 21,711 US utility patents granted since 2015.
How many patents have been filed in H01F?
21,711 US utility patents were granted in CPC subclass H01F between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in H01F?
Murata Manufacturing Co., Ltd. leads H01F with 1,164 patents, making it the most active assignee in this technology area.
How is patent data for H01F 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., H01) is a broad technology category. Subclasses like H01F 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.