PlainPatent

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 filing trajectory.

612
US patents granted
E01
Parent CPC class
20
Active assignees
+16%
5-yr velocity

The verdict

Construction OF Bridges ranks #518 of 670 CPC technology areas - 612 US patents granted since 2015, with filing up 16% over five years.

#518
of 670 CPC technology areas
612
US patents granted, 2015–2025
Soletanche Freyssinet
leading assignee (19)
+16%
filing velocity, last 5 yrs
Top assignee: Soletanche Freyssinet (19 patents)

CPC subclass E01D - CONSTRUCTION OF BRIDGES, ; ELEVATED ROADWAYS; OR VIADUCTS; ASSEMBLY OF BRIDGES - covers 612 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class E01 (CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES). See our CPC classification guide for how the system works.

The competitive landscape in E01D is shaped by 20 distinct companies actively filing in this space. Soletanche Freyssinet leads with 19 patents, followed by Paul Kristen, Inc. at 17 grants and Schul International Co., Llc at 11.

Filing activity in E01D is up 16% over the past five years versus 2015-2019, a relatively steady filing pace. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is E01D innovation accelerating?

US utility-patent grants per year in E01D, 2015–2025 - recent five years are up 16% versus 2015–2019.

304050607080 20152016201720182019202020212022202320242025 34

Who leads E01D?

The 12 most active assignees in CONSTRUCTION OF BRIDGES, ; ELEVATED ROADWAYS; OR VIADUCTS; ASSEMBLY OF BRIDGES - wider bars mean more grants

patents

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.

Source USPTO PatentsView, granted utility patents As of 2015–2025 grant years
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

About This Class

CPC subclass E01D belongs to class E01.

612 patents were granted in this class between 2015 and 2025.

20 companies actively patent in this space.

Classification System

Cooperative Patent Classification (CPC) is a hierarchical patent classification system used by the USPTO and EPO.

← All Technology Classes Technology Rankings →

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).

Top 14 E01D assignees by class footprint. Bubble size = patents in E01D. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 010203040 5101520 Patents in E01D Avg claims / patent (company-wide) Soletanche FreyssinetPaul KristenSchul InternationalPeri SeVsl InternationalChangsha University O…Safe RackDywidag-systems Inter…Ultimate Strength Cab…VersaflexContech Engineered So…Korea AirportsSafway ServicesShenzhen Municipal De…
Top 14 E01D assignees by class footprint. Bubble size = patents in E01D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class E01D?
CPC subclass E01D covers CONSTRUCTION OF BRIDGES, ; ELEVATED ROADWAYS; OR VIADUCTS; ASSEMBLY OF BRIDGES. It belongs to CPC class E01 (CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES), with 612 US utility patents granted since 2015.
How many patents have been filed in E01D?
612 US utility patents were granted in CPC subclass E01D between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in E01D?
Soletanche Freyssinet leads E01D with 19 patents, making it the most active assignee in this technology area.
How is patent data for E01D collected?
Patent data comes from USPTO PatentsView, a public research dataset maintained by the United States Patent and Trademark Office. It covers all US granted utility patents and assigns CPC codes based on the technology described in each patent.
What is the difference between CPC class and subclass?
A CPC class (e.g., E01) is a broad technology category. Subclasses like E01D provide finer granularity within that category. PlainPatent organizes data at the subclass level (4-character codes) for the most useful view of technology domains.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial

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.