PlainPatent

CPC technology class · E03

E03D - Water-closets OR Urinals WITH Flushing Devices

Water-closets or urinals with flushing devices; flushing valves therefor. 1,515 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

1,515
US patents granted
E03
Parent CPC class
20
Active assignees
+22%
5-yr velocity

The verdict

Water-closets OR Urinals WITH Flushing Devices ranks #404 of 670 CPC technology areas - 1,515 US patents granted since 2015, with filing up 22% over five years.

#404
of 670 CPC technology areas
1,515
US patents granted, 2015–2025
Toto
leading assignee (245)
+22%
filing velocity, last 5 yrs
Top assignee: TOTO Ltd. (245 patents)

CPC subclass E03D - WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR - covers 1,515 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 E03D is shaped by 20 distinct companies actively filing in this space. TOTO Ltd. leads with 245 patents, followed by Kohler Co. at 139 grants and Shanghai Kohler Electronics, Ltd. at 41.

Filing activity in E03D is up 22% 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 E03D innovation accelerating?

US utility-patent grants per year in E03D, 2015–2025 - recent five years are up 22% versus 2015–2019.

50100150200250 20152016201720182019202020212022202320242025 107

Who leads E03D?

The 12 most active assignees in WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR - wider bars mean more grants

patents

What this shows Toto is the most active filer in E03D, holding 245 of the 1,515 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 E03D
Rank Company Patents in E03D
#1 TOTO Ltd. 245
#2 Kohler Co. 139
#3 Shanghai Kohler Electronics, Ltd. 41
#4 Danco, Inc. 38
#5 AS America, Inc. 33
#6 Lixil Corporation 33
#7 SDB IP Holdings, Llc 29
#8 Sloan Valve Company 27
#9 MAG Aerospace Industries, Llc 24
#10 Fluidmaster, Inc. 24
#11 B/e Aerospace, Inc. 20
#12 ZURN Industries, Llc 19
#13 Geberit International Ag 18
#14 Coway Co., Ltd. 16
#15 Delta Faucet Company 13
#16 Hall Labs Llc 13
#17 Lavelle Industries, Inc. 13
#18 Reckitt Benckiser Llc 11
#19 AS IP Holdco, Llc 11
#20 Coflex S.a. De C.v. 11

About This Class

CPC subclass E03D belongs to class E03.

1,515 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 E03D 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 E03D assignees by class footprint. Bubble size = patents in E03D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 E03D assignees by class footprint. Bubble size = patents in E03D. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 510152025 0100200300 Patents in E03D Avg claims / patent (company-wide) TotoKohlerShanghai KohlerDancoAs AmericaLixilSdb Ip HoldingsSloan ValveMag Aerospace Industr…FluidmasterB/E AerospaceZurn IndustriesGeberit InternationalCoway
Top 14 E03D assignees by class footprint. Bubble size = patents in E03D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class E03D?
CPC subclass E03D covers WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR. It belongs to CPC class E03 (WATER SUPPLY; SEWERAGE), with 1,515 US utility patents granted since 2015.
How many patents have been filed in E03D?
1,515 US utility patents were granted in CPC subclass E03D between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in E03D?
TOTO Ltd. leads E03D with 245 patents, making it the most active assignee in this technology area.
How is patent data for E03D 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 E03D 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.