CPC technology class · E01

E01D - Construction Of Bridges

Construction of bridges, ; elevated roadways; or viaducts; assembly of bridges. 612 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

612
US patents granted: #5/5
in E01: 8.3%
E01 class share: +3%
5-yr velocity

The verdict

According to USPTO PatentsView, Construction Of Bridges ranks #518 of 670 CPC technology areas - 612 US patents granted since 2015, with recorded grant volume up 3% over five years.

#518
of 670 CPC technology areas: 612
US patents granted, 2015–2025: Soletanche Freyssinet
leading assignee (19): +3%
grant velocity, last 5 yrs

How E01D's grant cadence moved

Between 2020–2024, E01D recorded 276 grants versus 267 in 2015–2019 (+3% equal-window velocity). Across complete years, output peaked in 2019 at 71 grants and bottomed in 2015 at 37 (+92% peak-over-trough). Lead assignee Soletanche Freyssinet holds 3.1% of the class ; the top three share 7.7%.

Leaderboard read

E01D concentration, lead at 3.1%

Soletanche Freyssinet leads this historical grant record at 3.1% of E01D - foreign corporation assignees hold 51% of class grants (127 of 250). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 3.1%
Top three share: 7.7%
Lead over #2: 2

Where E01D sits inside E01

Among 5 subclasses in E01 (Construction OF Roads, Railways, OR Bridges), E01D ranks #5 and holds 8.3% of the parent class's 7,343 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

E01C 3,503 E01F 1,276 E01B 981 E01H 971

Rising assignees active in E01D

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 Peri SE 35x 0 → 35 company-wide · 10 in E01D
#2 Changsha University OF Science AND Technology 2.82x 11 → 31 company-wide · 9 in E01D
#3 Composites Intellectual Holdings, Inc. 1.25x 4 → 5 company-wide · 5 in E01D
#4 Maurer Engineering GmbH 1.00x 3 → 3 company-wide · 5 in E01D
#5 Soletanche Freyssinet 0.96x 23 → 22 company-wide · 19 in E01D

E01D grants by year, peak 2019 (71)

US utility-patent grants per year in E01D, 2015–2025 - recent five years are up 3% versus 2015–2019.

Soletanche Freyssinet

19
Paul Kristen

17
Schul International

11
Peri Se

10
Vsl International

10
Changsha University…

9
Safe Rack

9
Dywidag-systems…

9
Ultimate Strength…

8
Versaflex

7
Contech Engineered…

6
Korea Airports

6

What this shows Soletanche Freyssinet is the most active filer in E01D, holding 19 of the 612 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 E01D
Rank	Company	Patents in E01D
#1	Soletanche Freyssinet	19
#2	Paul Kristen, Inc.	17
#3	Schul International Co., LLC	11
#4	Peri SE	10
#5	VSL International AG	10
#6	Changsha University OF Science AND Technology	9
#7	Safe Rack LLC	9
#8	Dywidag-systems International GMBH	9
#9	Ultimate Strength Cable, LLC	8
#10	Versaflex, Inc.	7
#11	Contech Engineered Solutions LLC	6
#12	Korea Airports Corporation	6
#13	Safway Services, LLC	6
#14	Shenzhen Municipal Design & Research Institute Co., Ltd.	6
#15	Composites Intellectual Holdings, Inc.	5
#16	Maurer Engineering GmbH	5
#17	Valmont Industries, Inc.	4
#18	China International Marine Containers (GROUP) Co., Ltd.	4
#19	Shenzhen Cimc-tianda Airport Support Ltd.	4
#20	Hntb Corporation	4

Footprint here vs. claim strategy

Each dot is a leading E01D 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 E01D assignees by class footprint. Bubble size = patents in E01D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near E01D's 612-grant footprint

Nationwide nearest neighbors for E01D (#518 of 670 by volume ; lead share 3.1%) - not the E01 parent-class siblings above.

Nearest by grant volume

B03D 611 A23N 606 B67B 619 G04R 623

Nearest by lead-assignee share

A47C 3.1% C08L 3.1% F21Y 3.1% A47J 3.1%

Questions about E01D

Which company holds the most patents in E01D?

Soletanche Freyssinet leads E01D with 19 patents (3.1% of the subclass). By PatentsView assignee type, foreign corporations account for 51% of class grants.

Which E01D assignees grew fastest recently?

Among assignees with ≥5 grants in E01D, Peri SE shows the highest company-wide grant multiple (35x: 0 grants in 2019–2021 → 35 in 2022–2024) while holding 10 patents in this subclass. Growth is company-wide, not class-only.

How does E01D compare inside parent class E01?

Inside E01 (Construction OF Roads, Railways, OR Bridges), E01D ranks #5 of 5 subclasses by grant volume and holds 8.3% of the parent class total. The largest sibling is E01C (3,503 grants).

What to do with this data

E01D in context - here's where to go next.

Soletanche Freyssinet leads E01D with 19 grants in this class. See full portfolio
E01D ranks #518 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class E01, the largest sibling subclass is E01C with 3,503 grants. Explore E01C

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

Methodology - E01D figures are USPTO PatentsView granted-utility totals for this subclass (612 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.