PlainPatent

CPC technology class · C23

C23G - Cleaning OR De-greasing OF Metallic Material BY Chemical…

Cleaning or de-greasing of metallic material by chemical methods other than electrolysis. 703 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

703
US patents granted
C23
Parent CPC class
20
Active assignees
+46%
5-yr velocity

The verdict

Cleaning OR De-greasing OF Metallic Material BY Chemical… ranks #500 of 670 CPC technology areas - 703 US patents granted since 2015, with filing up 46% over five years.

#500
of 670 CPC technology areas
703
US patents granted, 2015–2025
Nippon Steel
leading assignee (41)
+46%
filing velocity, last 5 yrs
Top assignee: Nippon Steel Corporation (41 patents)

CPC subclass C23G - CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS - covers 703 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class C23 (COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTAT). See our CPC classification guide for how the system works.

The competitive landscape in C23G is shaped by 20 distinct companies actively filing in this space. Nippon Steel Corporation leads with 41 patents, followed by JFE Steel Corporation at 39 grants and Posco Co., Ltd at 17.

Filing activity in C23G is up 46% 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 C23G innovation accelerating?

US utility-patent grants per year in C23G, 2015–2025 - recent five years are up 46% versus 2015–2019.

30405060708090 20152016201720182019202020212022202320242025 61

Who leads C23G?

The 12 most active assignees in CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS - wider bars mean more grants

patents

What this shows Nippon Steel is the most active filer in C23G, holding 41 of the 703 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 C23G
Rank Company Patents in C23G
#1 Nippon Steel Corporation 41
#2 JFE Steel Corporation 39
#3 Posco Co., Ltd 17
#4 Arcelormittal 11
#5 Fujifilm Electronic Materials U.s.a., Inc. 10
#6 Fluid Energy Group Ltd. 9
#7 Chemetall Gmbh 8
#8 Primetals Technologies Japan, Ltd. 7
#9 Biomet 3i, Llc 6
#10 TOYO Kohan Co., Ltd. 6
#11 Hyundai Steel Company 6
#12 DORF Ketal Chemicals FZE 6
#13 Nippon Steel Stainless Steel Corporation 5
#14 Organo Corporation 4
#15 Advanced Technology & Materials Co., Ltd. 4
#16 IHI Machinery AND Furnace Co., Ltd. 4
#17 Green Products & Technologies, Llc 4
#18 Houghton Technical Corp. 4
#19 Prc-desoto International, Inc. 3
#20 Hydro Aluminum Rolled Products Gmbh 3

About This Class

CPC subclass C23G belongs to class C23.

703 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 C23G 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 C23G assignees by class footprint. Bubble size = patents in C23G. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 C23G assignees by class footprint. Bubble size = patents in C23G. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 51015202530 01020304050 Patents in C23G Avg claims / patent (company-wide) Nippon SteelJfe SteelPoscoArcelormittalFujifilm Materials UFluid Energy GroupChemetallPrimetals JapanBiomet 3iToyo KohanHyundai SteelDorf Ketal Chemicals…Nippon Steel Stainles…Organo
Top 14 C23G assignees by class footprint. Bubble size = patents in C23G. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class C23G?
CPC subclass C23G covers CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS. It belongs to CPC class C23 (COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTAT), with 703 US utility patents granted since 2015.
How many patents have been filed in C23G?
703 US utility patents were granted in CPC subclass C23G between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in C23G?
Nippon Steel Corporation leads C23G with 41 patents, making it the most active assignee in this technology area.
How is patent data for C23G 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., C23) is a broad technology category. Subclasses like C23G 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.