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 grant trajectory.

Compiled by PlainPatent · May 15, 2026

2,911
US patents granted: #1/4
in E03: 39.9%
E03 class share: +15%
5-yr velocity

The verdict

According to USPTO PatentsView, Domestic Plumbing Installations For Fresh Water Or Waste… ranks #323 of 670 CPC technology areas - 2,911 US patents granted since 2015, with recorded grant volume up 15% over five years.

#323
of 670 CPC technology areas: 2,911
US patents granted, 2015–2025: Kohler
leading assignee (301): +15%
grant velocity, last 5 yrs

How E03C's grant cadence moved

Between 2020–2024, E03C recorded 1,420 grants versus 1,237 in 2015–2019 (+15% equal-window velocity). Across complete years, output peaked in 2019 at 315 grants and bottomed in 2015 at 187 (+68% peak-over-trough). Lead assignee Kohler Co. holds 10.3% of the class ; the top three share 19.7%.

Leaderboard read

E03C concentration, lead at 10.3%

Kohler Co. leads this historical grant record at 10.3% of E03C - us corporation assignees hold 54% of class grants (1,133 of 2,093). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 10.3%
Top three share: 19.7%
Lead over #2: 155

Where E03C sits inside E03

Among 4 subclasses in E03 (Water SUPPLY; Sewerage), E03C ranks #1 and holds 39.9% of the parent class's 7,304 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

E03D 1,515 E03B 1,503 E03F 1,375

Rising assignees active in E03C

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 Assa Abloy Americas Residential Inc. 95x 0 → 95 company-wide · 17 in E03C
#2 Xiamen Delmei Sanitary Ware Co., Ltd. 32x 0 → 32 company-wide · 10 in E03C
#3 Xiamen Water Nymph Sanitary Technology Co., Ltd. 29x 1 → 29 company-wide · 7 in E03C
#4 Insinkerator LLC 27x 0 → 27 company-wide · 15 in E03C
#5 Wenzhou Furuisi Building Materials Co., Ltd. 23x 0 → 23 company-wide · 6 in E03C

E03C grants by year, peak 2019 (315)

US utility-patent grants per year in E03C, 2015–2025 - recent five years are up 15% versus 2015–2019.

Kohler

301
Delta Faucet

146
Neoperl

127
Xiamen Solex…

80
Kohler Mira

66
Grohe

49
Xiamen Lota Internatio…

47
Toto

45
Wcm Industries

40
Globe Union Industrial

37
As America

35
Moen Incorporated

30

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.

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

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).

Classes near E03C's 2,911-grant footprint

Nationwide nearest neighbors for E03C (#323 of 670 by volume ; lead share 10.3%) - not the E03 parent-class siblings above.

Nearest by grant volume

B02C 2,934 A62C 2,939 F24H 2,950 G05G 2,952

Nearest by lead-assignee share

A47L 10.3% G07D 10.3% B64D 10.4% F02M 10.4%

Questions about E03C

Which company holds the most patents in E03C?

Kohler Co. leads E03C with 301 patents (10.3% of the subclass). By PatentsView assignee type, us corporations account for 54% of class grants.

Which E03C assignees grew fastest recently?

Among assignees with ≥5 grants in E03C, Assa Abloy Americas Residential Inc. shows the highest company-wide grant multiple (95x: 0 grants in 2019–2021 → 95 in 2022–2024) while holding 17 patents in this subclass. Growth is company-wide, not class-only.

How does E03C compare inside parent class E03?

Inside E03 (Water SUPPLY; Sewerage), E03C ranks #1 of 4 subclasses by grant volume and holds 39.9% of the parent class total. The largest sibling is E03D (1,515 grants).

What to do with this data

E03C in context - here's where to go next.

Kohler Co. leads E03C with 301 grants in this class. See full portfolio
E03C ranks #323 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class E03, the largest sibling subclass is E03D with 1,515 grants. Explore E03D

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

Methodology - E03C figures are USPTO PatentsView granted-utility totals for this subclass (2,911 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.