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CPC technology class · E03

E03C - Domestic Plumbing Installations FOR Fresh Water OR Waste…

Domestic plumbing installations for fresh water or waste water ; sinks. 2,911 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

2,911
US patents granted
E03
Parent CPC class
20
Active assignees
+33%
5-yr velocity

The verdict

Domestic Plumbing Installations FOR Fresh Water OR Waste… ranks #323 of 670 CPC technology areas - 2,911 US patents granted since 2015, with filing up 33% over five years.

#323
of 670 CPC technology areas
2,911
US patents granted, 2015–2025
Kohler
leading assignee (301)
+33%
filing velocity, last 5 yrs
Top assignee: Kohler Co. (301 patents)

CPC subclass E03C - DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER ; SINKS - covers 2,911 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class E03 (WATER SUPPLY; SEWERAGE). See our CPC classification guide for how the system works.

The competitive landscape in E03C is shaped by 20 distinct companies actively filing in this space. Kohler Co. leads with 301 patents, followed by Delta Faucet Company at 146 grants and Neoperl Gmbh at 127.

Filing activity in E03C is up 33% 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 E03C innovation accelerating?

US utility-patent grants per year in E03C, 2015–2025 - recent five years are up 33% versus 2015–2019.

150200250300350 20152016201720182019202020212022202320242025 226

Who leads E03C?

The 12 most active assignees in DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER ; SINKS - wider bars mean more grants

patents

What this shows Kohler is the most active filer in E03C, holding 301 of the 2,911 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 E03C
Rank Company Patents in E03C
#1 Kohler Co. 301
#2 Delta Faucet Company 146
#3 Neoperl Gmbh 127
#4 Xiamen Solex High-tech Industries Co., Ltd. 80
#5 Kohler Mira Limited 66
#6 Grohe Ag 49
#7 Xiamen Lota International Co., Ltd. 47
#8 TOTO Ltd. 45
#9 WCM Industries, Inc. 40
#10 Globe Union Industrial Corp. 37
#11 AS America, Inc. 35
#12 Moen Incorporated 30
#13 Hansgrohe SE 27
#14 Water Pik, Inc. 21
#15 Elkay Manufacturing Company 20
#16 Geberit International Ag 20
#17 Xiamen Runner Industrial Corporation 20
#18 Bradley Fixtures, Llc 19
#19 Watts Regulator Co. 19
#20 Danco, Inc. 19

About This Class

CPC subclass E03C belongs to class E03.

2,911 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 E03C 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 E03C assignees by class footprint. Bubble size = patents in E03C. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 E03C assignees by class footprint. Bubble size = patents in E03C. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 051015 0100200300400 Patents in E03C Avg claims / patent (company-wide) KohlerDelta FaucetNeoperlXiamen Solex High-tec…Kohler MiraGroheXiamen Lota Internati…TotoWcm IndustriesGlobe Union IndustrialAs AmericaMoen IncorporatedHansgrohe SeWater Pik
Top 14 E03C assignees by class footprint. Bubble size = patents in E03C. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class E03C?
CPC subclass E03C covers DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER ; SINKS. It belongs to CPC class E03 (WATER SUPPLY; SEWERAGE), with 2,911 US utility patents granted since 2015.
How many patents have been filed in E03C?
2,911 US utility patents were granted in CPC subclass E03C between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in E03C?
Kohler Co. leads E03C with 301 patents, making it the most active assignee in this technology area.
How is patent data for E03C 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., E03) is a broad technology category. Subclasses like E03C 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.