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CPC technology class · H02

H02K - Dynamo-electric Machines

Dynamo-electric machines. 26,848 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

26,848
US patents granted
H02
Parent CPC class
20
Active assignees
+54%
5-yr velocity

The verdict

Dynamo-electric Machines ranks #76 of 670 CPC technology areas - 26,848 US patents granted since 2015, with filing up 54% over five years.

#76
of 670 CPC technology areas
26,848
US patents granted, 2015–2025
Mitsubishi Electric
leading assignee (996)
+54%
filing velocity, last 5 yrs
Top assignee: Mitsubishi Electric Corporation (996 patents)

CPC subclass H02K - DYNAMO-ELECTRIC MACHINES - covers 26,848 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class H02 (GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER). See our CPC classification guide for how the system works.

The competitive landscape in H02K is shaped by 20 distinct companies actively filing in this space. Mitsubishi Electric Corporation leads with 996 patents, followed by Denso Corporation at 728 grants and LG Innotek Co., Ltd. at 573.

Filing activity in H02K is up 54% 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 H02K innovation accelerating?

US utility-patent grants per year in H02K, 2015–2025 - recent five years are up 54% versus 2015–2019.

1,0001,5002,0002,5003,000 20152016201720182019202020212022202320242025 2,162

Who leads H02K?

The 12 most active assignees in DYNAMO-ELECTRIC MACHINES - wider bars mean more grants

patents

What this shows Mitsubishi Electric is the most active filer in H02K, holding 996 of the 26,848 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 H02K
Rank Company Patents in H02K
#1 Mitsubishi Electric Corporation 996
#2 Denso Corporation 728
#3 LG Innotek Co., Ltd. 573
#4 Nidec Corporation 571
#5 Hamilton Sundstrand Corporation (hsc) 419
#6 Honda Motor Co., Ltd. 408
#7 Siemens Aktiengesellschaft 377
#8 TDK Taiwan Corp. 241
#9 Schaeffler Technologies Ag & Co. KG 231
#10 Fanuc Corporation 230
#11 Minebea Mitsumi Inc. 185
#12 Black & Decker Inc. 162
#13 Regal Beloit America, Inc. 149
#14 Borgwarner Inc. 146
#15 AAC Technologies Pte. Ltd. 143
#16 Nidec Motor Corporation 143
#17 Johnson Electric International Ag 137
#18 Makita Corporation 136
#19 Hitachi Automotive Systems, Ltd. 130
#20 Milwaukee Electric Tool Corporation 127

About This Class

CPC subclass H02K belongs to class H02.

26,848 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 H02K 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 H02K assignees by class footprint. Bubble size = patents in H02K. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 H02K assignees by class footprint. Bubble size = patents in H02K. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 5101520 020040060080010001200 Patents in H02K Avg claims / patent (company-wide) Mitsubishi ElectricDensoLg InnotekNidecHamilton Sundstrand (…Honda MotorSiemens Aktiengesells…Tdk TaiwanSchaeffler & KgFanucMinebea MitsumiBlack & DeckerRegal Beloit AmericaBorgwarner
Top 14 H02K assignees by class footprint. Bubble size = patents in H02K. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class H02K?
CPC subclass H02K covers DYNAMO-ELECTRIC MACHINES. It belongs to CPC class H02 (GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER), with 26,848 US utility patents granted since 2015.
How many patents have been filed in H02K?
26,848 US utility patents were granted in CPC subclass H02K between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in H02K?
Mitsubishi Electric Corporation leads H02K with 996 patents, making it the most active assignee in this technology area.
How is patent data for H02K 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., H02) is a broad technology category. Subclasses like H02K 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.