CPC technology class · E02

E02C - Ship-lifting Devices Or Mechanisms

Ship-lifting devices or mechanisms. 11 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

11
US patents granted: #4/4
in E02: 0.1%
E02 class share: +150%
5-yr velocity

The verdict

According to USPTO PatentsView, Ship-lifting Devices Or Mechanisms ranks #660 of 670 CPC technology areas - 11 US patents granted since 2015, with recorded grant volume up 150% over five years.

#660
of 670 CPC technology areas: 11
US patents granted, 2015–2025: China Institute of Water…
leading assignee (1): +150%
grant velocity, last 5 yrs

How E02C's grant cadence moved

Between 2020–2024, E02C recorded 5 grants versus 2 in 2015–2019 (+150% equal-window velocity). Across complete years, output peaked in 2020 at 2 grants and bottomed in 2015 at 1 (+100% peak-over-trough). Lead assignee Nanjing Hydraulic Research Institute holds 9.1% of the class ; the top three share 27.3%.

Leaderboard read

E02C concentration, lead at 9.1%

Nanjing Hydraulic Research Institute leads this historical grant record at 9.1% of E02C - foreign corporation assignees hold 60% of class grants (3 of 5). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 9.1%
Top three share: 27.3%
Lead over #2: 0

Where E02C sits inside E02

Among 4 subclasses in E02 (Hydraulic ENGINEERING; FOUNDATIONS; Soil Shifting), E02C ranks #4 and holds 0.1% 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 E02B 1,837

E02C grants by year, peak 2020 (2)

US utility-patent grants per year in E02C, 2015–2025 - recent five years are up 150% versus 2015–2019.

Nanjing Hydraulic…

1
Bardex

1
Shanghai Maritime…

1
Waterbox Oy

1
U S Geological Survey

1

What this shows China Institute of… is the most active filer in E02C, holding 1 of the 11 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 E02C
Rank	Company	Patents in E02C
#1	Nanjing Hydraulic Research Institute	1
#2	Bardex Corporation	1
#3	Shanghai Maritime University	1
#4	Waterbox OY	1
#5	U.S. Geological Survey	1

Footprint here vs. claim strategy

Each dot is a leading E02C 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 5 E02C assignees by class footprint. Bubble size = patents in E02C. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Questions about E02C

Which company holds the most patents in E02C?

China Institute of Water Resources and Hydropower Research leads E02C with 1 patents (9.1% of the subclass). By PatentsView assignee type, foreign corporations account for 60% of class grants.

How does E02C compare inside parent class E02?

Inside E02 (Hydraulic ENGINEERING; FOUNDATIONS; Soil Shifting), E02C ranks #4 of 4 subclasses by grant volume and holds 0.1% of the parent class total. The largest sibling is E02F (7,816 grants).

What to do with this data

E02C in context - here's where to go next.

Nanjing Hydraulic Research Institute leads E02C with 1 grants in this class. See full portfolio
E02C ranks #660 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 - E02C figures are USPTO PatentsView granted-utility totals for this subclass (11 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.