CPC technology class · C25

C25D - Processes For The Electrolytic Or Electrophoretic Product…

Processes for the electrolytic or electrophoretic production of coatings; electroforming; apparatus therefor. 6,127 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

6,127
US patents granted: #1/4
in C25: 51.9%
C25 class share: -2%
5-yr velocity

The verdict

According to USPTO PatentsView, Processes For The Electrolytic Or Electrophoretic Product… ranks #232 of 670 CPC technology areas - 6,127 US patents granted since 2015, with recorded grant volume down 2% over five years.

#232
of 670 CPC technology areas: 6,127
US patents granted, 2015–2025: Ebara
leading assignee (187): -2%
grant velocity, last 5 yrs

How C25D's grant cadence moved

Between 2020–2024, C25D recorded 2,619 grants versus 2,679 in 2015–2019 (-2% equal-window velocity). Across complete years, output peaked in 2019 at 658 grants and bottomed in 2015 at 417 (+58% peak-over-trough). Lead assignee Ebara Corporation holds 3.1% of the class ; the top three share 6.4%.

Leaderboard read

C25D concentration, lead at 3.1%

Ebara Corporation leads this historical grant record at 3.1% of C25D - foreign corporation assignees hold 67% of class grants (1,684 of 2,520). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 3.1%
Top three share: 6.4%
Lead over #2: 73

Where C25D sits inside C25

Among 4 subclasses in C25 (Electrolytic OR Electrophoretic PROCESSES; Apparatus Therefor), C25D ranks #1 and holds 51.9% of the parent class's 11,805 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

C25B 4,224 C25C 753 C25F 701

Rising assignees active in C25D

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 SK Nexilis Co., Ltd. 8.00x 0 → 8 company-wide · 9 in C25D
#2 Xerion Advanced Battery Corporation 5.00x 1 → 5 company-wide · 7 in C25D
#3 Fabric8labs, Inc. 4.00x 5 → 20 company-wide · 32 in C25D
#4 Yuken Industry Co., Ltd. 4.00x 0 → 4 company-wide · 5 in C25D
#5 Lacks Enterprises, Inc. 2.25x 8 → 18 company-wide · 7 in C25D

C25D grants by year, peak 2019 (658)

US utility-patent grants per year in C25D, 2015–2025 - recent five years are down 2% versus 2015–2019.

Ebara

187
Lam Research

114
Nippon Steel

91
Atotech Deutschland &…

89
Rohm and Haas…

86
Jfe Steel

85
Novellus Systems

69
Jx Nippon Mining &…

52
Ppg Industries Ohio

51
Nippon Steel &…

50
Mitsubishi Materials

49
Chang Chun Petrochemic…

43

What this shows Ebara is the most active filer in C25D, holding 187 of the 6,127 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 C25D
Rank	Company	Patents in C25D
#1	Ebara Corporation	187
#2	Lam Research Corporation	114
#3	Nippon Steel Corporation	91
#4	Atotech Deutschland GmbH & Co. KG	89
#5	Rohm and Haas Electronic Materials LLC	86
#6	JFE Steel Corporation	85
#7	Novellus Systems, Inc.	69
#8	JX Nippon Mining & Metals Corporation	52
#9	PPG Industries Ohio, Inc.	51
#10	Nippon Steel & Sumitomo Metal Corporation	50
#11	Mitsubishi Materials Corporation	49
#12	Chang Chun Petrochemical Co., Ltd.	43
#13	Toyo Kohan Co., Ltd.	39
#14	Modumetal, Inc.	33
#15	MacDermid Enthone Inc.	32
#16	Fabric8labs, Inc.	32
#17	ArcelorMittal	29
#18	Dowa Metaltech Co., Ltd.	23
#19	C.Uyemura & Co., Ltd.	22
#20	Mitsui Mining & Smelting Co., Ltd.	21

Footprint here vs. claim strategy

Each dot is a leading C25D 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 C25D assignees by class footprint. Bubble size = patents in C25D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near C25D's 6,127-grant footprint

Nationwide nearest neighbors for C25D (#232 of 670 by volume ; lead share 3.1%) - not the C25 parent-class siblings above.

Nearest by grant volume

G02C 6,144 B25B 6,226 A43B 6,010 D06F 6,009

Nearest by lead-assignee share

C25C 3.1% A01N 3.0% C04B 3.0% C08K 3.0%

Questions about C25D

Which company holds the most patents in C25D?

Ebara Corporation leads C25D with 187 patents (3.1% of the subclass). By PatentsView assignee type, foreign corporations account for 67% of class grants.

Which C25D assignees grew fastest recently?

Among assignees with ≥5 grants in C25D, SK Nexilis Co., Ltd. shows the highest company-wide grant multiple (8.00x: 0 grants in 2019–2021 → 8 in 2022–2024) while holding 9 patents in this subclass. Growth is company-wide, not class-only.

How does C25D compare inside parent class C25?

Inside C25 (Electrolytic OR Electrophoretic PROCESSES; Apparatus Therefor), C25D ranks #1 of 4 subclasses by grant volume and holds 51.9% of the parent class total. The largest sibling is C25B (4,224 grants).

What to do with this data

C25D in context - here's where to go next.

Ebara Corporation leads C25D with 187 grants in this class. See full portfolio
C25D ranks #232 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class C25, the largest sibling subclass is C25B with 4,224 grants. Explore C25B

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

Methodology - C25D figures are USPTO PatentsView granted-utility totals for this subclass (6,127 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.