PlainPatent

CPC technology class · E01

E01F - Additional WORK

Additional work, such as equipping roads or the construction of platforms, helicopter landing stages, signs, snow fences, or the like. 1,276 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

1,276
US patents granted
E01
Parent CPC class
20
Active assignees
+33%
5-yr velocity

The verdict

Additional WORK ranks #422 of 670 CPC technology areas - 1,276 US patents granted since 2015, with filing up 33% over five years.

#422
of 670 CPC technology areas
1,276
US patents granted, 2015–2025
Traffix Devices
leading assignee (37)
+33%
filing velocity, last 5 yrs
Top assignee: Traffix Devices, Inc. (37 patents)

CPC subclass E01F - ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE - covers 1,276 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 E01F is shaped by 20 distinct companies actively filing in this space. Traffix Devices, Inc. leads with 37 patents, followed by Lindsay Transportation Solutions, Llc at 27 grants and Aichi Steel Corporation at 23.

Filing activity in E01F is up 33% over the past five years versus 2015-2019, a sharp acceleration suggesting an emerging or fast-moving technology area. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is E01F innovation accelerating?

US utility-patent grants per year in E01F, 2015–2025 - recent five years are up 33% versus 2015–2019.

90100110120130140 20152016201720182019202020212022202320242025 101

Who leads E01F?

The 12 most active assignees in ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE - wider bars mean more grants

patents

What this shows Traffix Devices is the most active filer in E01F, holding 37 of the 1,276 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 E01F
Rank Company Patents in E01F
#1 Traffix Devices, Inc. 37
#2 Lindsay Transportation Solutions, Llc 27
#3 Aichi Steel Corporation 23
#4 Concaten, Inc. 20
#5 Geobrugg Ag 12
#6 Valmont Highway Technology Limited 12
#7 Mccue Corporation 11
#8 Neusch Innovations, Lp 10
#9 Energy Absorption Systems, Inc. 9
#10 ATG Access Ltd 8
#11 HILL & Smith Limited 8
#12 Industrial Galvanizers Corporation Pty Ltd. 8
#13 Flint Trading, Inc. 7
#14 Earthstone International Llc 7
#15 Delta Scientific Corporation 7
#16 Southwest Jiaotong University 6
#17 Contech Engineered Solutions Llc 6
#18 Ennis-flint, Inc. 6
#19 American Louver Company 6
#20 Potters Industries, Llc 6

About This Class

CPC subclass E01F belongs to class E01.

1,276 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 E01F 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 E01F assignees by class footprint. Bubble size = patents in E01F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 E01F assignees by class footprint. Bubble size = patents in E01F. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 510152025 010203040 Patents in E01F Avg claims / patent (company-wide) Traffix DevicesLindsay Transportatio…Aichi SteelConcatenGeobruggValmont Highway Techn…MccueNeusch InnovationsEnergy Absorption Sys…Atg AccessHill & SmithIndustrial Galvanizer…Flint TradingEarthstone Internatio…
Top 14 E01F assignees by class footprint. Bubble size = patents in E01F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class E01F?
CPC subclass E01F covers ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE. It belongs to CPC class E01 (CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES), with 1,276 US utility patents granted since 2015.
How many patents have been filed in E01F?
1,276 US utility patents were granted in CPC subclass E01F between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in E01F?
Traffix Devices, Inc. leads E01F with 37 patents, making it the most active assignee in this technology area.
How is patent data for E01F 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 E01F 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.