CPC technology class · E02

E02B - Hydraulic Engineering

Hydraulic engineering. 1,837 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

1,837
US patents granted: #3/4
in E02: 14.1%
E02 class share: -7%
5-yr velocity

The verdict

According to USPTO PatentsView, Hydraulic Engineering ranks #374 of 670 CPC technology areas - 1,837 US patents granted since 2015, with recorded grant volume down 7% over five years.

#374
of 670 CPC technology areas: 1,837
US patents granted, 2015–2025: Saudi Arabian Oil
leading assignee (23): -7%
grant velocity, last 5 yrs

How E02B's grant cadence moved

Between 2020–2024, E02B recorded 789 grants versus 845 in 2015–2019 (-7% equal-window velocity). Across complete years, output peaked in 2019 at 198 grants and bottomed in 2023 at 124 (+60% peak-over-trough). Lead assignee Siemens Gamesa Renewable Energy holds 0.8% of the class ; the top three share 2.2%.

Leaderboard read

E02B concentration, lead at 0.8%

Siemens Gamesa Renewable Energy leads this historical grant record at 0.8% of E02B - foreign corporation assignees hold 54% of class grants (404 of 748). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 0.8%
Top three share: 2.2%
Lead over #2: 0

Where E02B sits inside E02

Among 4 subclasses in E02 (Hydraulic ENGINEERING; FOUNDATIONS; Soil Shifting), E02B ranks #3 and holds 14.1% of the parent class's 13,033 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

E02F 7,816 E02D 3,369 E02C 11

Rising assignees active in E02B

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 Wilkinson Ecological Design 6.00x 0 → 6 company-wide · 8 in E02B
#2 C-ling Limited 5.00x 0 → 5 company-wide · 5 in E02B
#3 Smith-Root, Inc. 3.00x 0 → 3 company-wide · 5 in E02B
#4 Siemens Gamesa Renewable Energy 1.97x 147 → 289 company-wide · 14 in E02B
#5 Nanjing Hydraulic Research Institute 1.83x 6 → 11 company-wide · 6 in E02B

E02B grants by year, peak 2019 (198)

US utility-patent grants per year in E02B, 2015–2025 - recent five years are down 7% versus 2015–2019.

Siemens Gamesa…

14
Hitachi Zosen

14
Itrec B V

13
Ihc Holland Ie B V

12
Rubicon Research Pty

12
Waskey Bridges

12
Halo Maritime Defense…

10
Rsa Protective

10
Mkb

9
Motz Enterprises

9
Technip France

8
Equinor Energy As

8

What this shows Saudi Arabian Oil is the most active filer in E02B, holding 23 of the 1,837 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 E02B
Rank	Company	Patents in E02B
#1	Siemens Gamesa Renewable Energy	14
#2	Hitachi Zosen Corporation	14
#3	Itrec B.V.	13
#4	IHC Holland IE B.V.	12
#5	Rubicon Research PTY Ltd	12
#6	Waskey Bridges, Inc.	12
#7	Halo Maritime Defense Systems, Inc.	10
#8	RSA Protective Technologies, LLC	10
#9	MKB Company, LLC	9
#10	Motz Enterprises, Inc.	9
#11	Technip France	8
#12	Equinor Energy AS	8
#13	Korea Institute of Ocean Science & Technology	8
#14	innogy SE	8
#15	BIO Clean Environmental Services, LLC	8
#16	Keppel Offshore & Marine Technology Centre PTE Ltd	8
#17	Institute of Mountain Hazzards and Environment, Chinese Academy of Sciences	8
#18	GustoMSC B.V.	8
#19	P.V. Flood Control Corp.	8
#20	Wilkinson Ecological Design	8

Footprint here vs. claim strategy

Each dot is a leading E02B 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 E02B assignees by class footprint. Bubble size = patents in E02B. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near E02B's 1,837-grant footprint

Nationwide nearest neighbors for E02B (#374 of 670 by volume ; lead share 1.3%) - not the E02 parent-class siblings above.

Nearest by grant volume

F16G 1,830 H01T 1,823 A23P 1,818 D04B 1,864

Nearest by lead-assignee share

Y10T 1.2% A47G 1.3% E04H 1.3% A61K 1.2%

Questions about E02B

Which company holds the most patents in E02B?

Saudi Arabian OIL Company leads E02B with 23 patents (0.8% of the subclass). By PatentsView assignee type, foreign corporations account for 54% of class grants.

Which E02B assignees grew fastest recently?

Among assignees with ≥5 grants in E02B, Wilkinson Ecological Design shows the highest company-wide grant multiple (6.00x: 0 grants in 2019–2021 → 6 in 2022–2024) while holding 8 patents in this subclass. Growth is company-wide, not class-only.

How does E02B compare inside parent class E02?

Inside E02 (Hydraulic ENGINEERING; FOUNDATIONS; Soil Shifting), E02B ranks #3 of 4 subclasses by grant volume and holds 14.1% of the parent class total. The largest sibling is E02F (7,816 grants).

What to do with this data

E02B in context - here's where to go next.

Siemens Gamesa Renewable Energy leads E02B with 14 grants in this class. See full portfolio
E02B ranks #374 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class E02, the largest sibling subclass is E02F with 7,816 grants. Explore E02F

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

Methodology - E02B figures are USPTO PatentsView granted-utility totals for this subclass (1,837 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.