CPC technology class · E04

E04H - Buildings Or Like Structures For Particular Purposes

Buildings or like structures for particular purposes; swimming or splash baths or pools; masts; fencing; tents or canopies, in general. 6,263 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

6,263
US patents granted: #2/6
in E04: 22.1%
E04 class share: +9%
5-yr velocity

The verdict

According to USPTO PatentsView, Buildings Or Like Structures For Particular Purposes ranks #229 of 670 CPC technology areas - 6,263 US patents granted since 2015, with recorded grant volume up 9% over five years.

#229
of 670 CPC technology areas: 6,263
US patents granted, 2015–2025: Hayward Industries
leading assignee (83): +9%
grant velocity, last 5 yrs

How E04H's grant cadence moved

Between 2020–2024, E04H recorded 2,959 grants versus 2,710 in 2015–2019 (+9% equal-window velocity). Across complete years, output peaked in 2019 at 653 grants and bottomed in 2015 at 430 (+52% peak-over-trough). Lead assignee Hayward Industries, Inc. holds 1.3% of the class ; the top three share 3.5%.

Leaderboard read

E04H concentration, lead at 1.3%

Hayward Industries, Inc. leads this historical grant record at 1.3% of E04H - us corporation assignees hold 61% of class grants (1,913 of 3,127). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 1.3%
Top three share: 3.5%
Lead over #2: 14

Where E04H sits inside E04

Among 6 subclasses in E04 (Building), E04H ranks #2 and holds 22.1% of the parent class's 28,319 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

E04B 7,959 E04F 5,179 E04C 3,792 E04G 2,717 E04D 2,409

Rising assignees active in E04H

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 GE Infrastructure Technology LLC 80x 2 → 160 company-wide · 10 in E04H
#2 Ardisam, Inc. 14x 1 → 14 company-wide · 10 in E04H
#3 Colhurst Concepts, LLC 8.00x 1 → 8 company-wide · 8 in E04H
#4 UFP Industries, Inc. 8.00x 0 → 8 company-wide · 6 in E04H
#5 Latham Pool Products, Inc. 6.33x 3 → 19 company-wide · 11 in E04H

E04H grants by year, peak 2019 (653)

US utility-patent grants per year in E04H, 2015–2025 - recent five years are up 9% versus 2015–2019.

Hayward Industries

83
Pentair Water Pool…

69
Maytronics

67
Zodiac Pool Systems

62
Bestway Inflatables &…

51
Zodiac Pool Care…

48
Vestas Wind Systems…

44
Intex Marketing

35
King Technology

32
Wobben Properties

31
Campvalley (Xiamen)

29
Aqua Products

29

What this shows Hayward Industries is the most active filer in E04H, holding 83 of the 6,263 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 E04H
Rank	Company	Patents in E04H
#1	Hayward Industries, Inc.	83
#2	Pentair Water Pool and Spa, Inc.	69
#3	Maytronics Ltd.	67
#4	Zodiac Pool Systems LLC	62
#5	Bestway Inflatables & Material Corp.	51
#6	Zodiac Pool Care Europe	48
#7	Vestas Wind Systems A/S	44
#8	Intex Marketing Ltd.	35
#9	King Technology, Inc.	32
#10	Wobben Properties GmbH	31
#11	Campvalley (Xiamen) Co., Ltd.	29
#12	Aqua Products, Inc.	29
#13	Simpson Strong-Tie Company, Inc.	23
#14	Polygroup Macau Limited (BVI)	23
#15	Crystal Lagoons Technologies, Inc.	23
#16	Ocado Innovation Limited	22
#17	GSG Holdings, Inc.	19
#18	Siemens Gamesa Renewable Energy	18
#19	Nabors Drilling Technologies USA, Inc.	18
#20	Trojan Leisure Products, LLC	18

Footprint here vs. claim strategy

Each dot is a leading E04H 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 E04H assignees by class footprint. Bubble size = patents in E04H. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near E04H's 6,263-grant footprint

Nationwide nearest neighbors for E04H (#229 of 670 by volume ; lead share 1.3%) - not the E04 parent-class siblings above.

Nearest by grant volume

A01G 6,293 B25B 6,226 G16B 6,310 B41M 6,377

Nearest by lead-assignee share

A47G 1.3% C12M 1.3% B01D 1.4% E02B 1.3%

Questions about E04H

Which company holds the most patents in E04H?

Hayward Industries, Inc. leads E04H with 83 patents (1.3% of the subclass). By PatentsView assignee type, us corporations account for 61% of class grants.

Which E04H assignees grew fastest recently?

Among assignees with ≥5 grants in E04H, GE Infrastructure Technology LLC shows the highest company-wide grant multiple (80x: 2 grants in 2019–2021 → 160 in 2022–2024) while holding 10 patents in this subclass. Growth is company-wide, not class-only.

How does E04H compare inside parent class E04?

Inside E04 (Building), E04H ranks #2 of 6 subclasses by grant volume and holds 22.1% of the parent class total. The largest sibling is E04B (7,959 grants).

What to do with this data

E04H in context - here's where to go next.

Hayward Industries, Inc. leads E04H with 83 grants in this class. See full portfolio
E04H ranks #229 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class E04, the largest sibling subclass is E04B with 7,959 grants. Explore E04B

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

Methodology - E04H figures are USPTO PatentsView granted-utility totals for this subclass (6,263 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.