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 grant trajectory.

Compiled by PlainPatent · May 15, 2026

26,848
US patents granted: #3/9
in H02: 16.6%
H02 class share: +33%
5-yr velocity

The verdict

According to USPTO PatentsView, Dynamo-electric Machines ranks #76 of 670 CPC technology areas - 26,848 US patents granted since 2015, with recorded grant volume up 33% over five years.

#76
of 670 CPC technology areas: 26,848
US patents granted, 2015–2025: Mitsubishi Electric
leading assignee (996): +33%
grant velocity, last 5 yrs

How H02K's grant cadence moved

Between 2020–2024, H02K recorded 13,513 grants versus 10,174 in 2015–2019 (+33% equal-window velocity). Across complete years, output peaked in 2024 at 2,866 grants and bottomed in 2015 at 1,527 (+88% peak-over-trough). Lead assignee Mitsubishi Electric Corporation holds 3.7% of the class ; the top three share 8.6%.

Leaderboard read

H02K concentration, lead at 3.7%

Mitsubishi Electric Corporation leads this historical grant record at 3.7% of H02K - foreign corporation assignees hold 78% of class grants (13,719 of 17,659). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 3.7%
Top three share: 8.6%
Lead over #2: 268

Where H02K sits inside H02

Among 9 subclasses in H02 (GENERATION; Conversion OR Distribution OF Electric Power), H02K ranks #3 and holds 16.6% of the parent class's 161,326 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

H02J 49,883 H02M 33,952 H02P 16,031 H02G 11,084 H02H 10,591 H02S 6,483 H02N 3,799 H02B 2,655

Rising assignees active in H02K

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 Huawei Digital Power Technologies Co., Ltd. 245x 0 → 245 company-wide · 20 in H02K
#2 HL Mando Corporation 212x 0 → 212 company-wide · 19 in H02K
#3 Proterial, Ltd. 139x 0 → 139 company-wide · 13 in H02K
#4 Beta AIR LLC 61x 6 → 367 company-wide · 23 in H02K
#5 Brooks Automation US, LLC 57x 0 → 57 company-wide · 7 in H02K

H02K grants by year, peak 2024 (2,866)

US utility-patent grants per year in H02K, 2015–2025 - recent five years are up 33% versus 2015–2019.

Mitsubishi Electric

996
Denso

728
Lg Innotek

573
Nidec

571
Hamilton Sundstrand…

419
Honda Motor

408
Siemens Aktiengesellsc…

377
Tdk Taiwan

241
Schaeffler & Kg

231
Fanuc

230
Minebea Mitsumi

185
Black & Decker

162

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.

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

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).

Classes near H02K's 26,848-grant footprint

Nationwide nearest neighbors for H02K (#76 of 670 by volume ; lead share 3.7%) - not the H02 parent-class siblings above.

Nearest by grant volume

G03G 26,691 B41J 26,654 G08G 27,080 G06K 27,107

Nearest by lead-assignee share

H04R 3.7% C05B 3.7% H01H 3.7% B60B 3.7%

Questions about H02K

Which company holds the most patents in H02K?

Mitsubishi Electric Corporation leads H02K with 996 patents (3.7% of the subclass). By PatentsView assignee type, foreign corporations account for 78% of class grants.

Which H02K assignees grew fastest recently?

Among assignees with ≥5 grants in H02K, Huawei Digital Power Technologies Co., Ltd. shows the highest company-wide grant multiple (245x: 0 grants in 2019–2021 → 245 in 2022–2024) while holding 20 patents in this subclass. Growth is company-wide, not class-only.

How does H02K compare inside parent class H02?

Inside H02 (GENERATION; Conversion OR Distribution OF Electric Power), H02K ranks #3 of 9 subclasses by grant volume and holds 16.6% of the parent class total. The largest sibling is H02J (49,883 grants).

What to do with this data

H02K in context - here's where to go next.

Mitsubishi Electric Corporation leads H02K with 996 grants in this class. See full portfolio
H02K ranks #76 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class H02, the largest sibling subclass is H02J with 49,883 grants. Explore H02J

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

Methodology - H02K figures are USPTO PatentsView granted-utility totals for this subclass (26,848 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.