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 grant trajectory.

Compiled by PlainPatent · May 15, 2026

1,276
US patents granted: #2/5
in E01: 17.4%
E01 class share: +14%
5-yr velocity

The verdict

According to USPTO PatentsView, Additional Work ranks #422 of 670 CPC technology areas - 1,276 US patents granted since 2015, with recorded grant volume up 14% over five years.

#422
of 670 CPC technology areas: 1,276
US patents granted, 2015–2025: Traffix Devices
leading assignee (37): +14%
grant velocity, last 5 yrs

How E01F's grant cadence moved

Between 2020–2024, E01F recorded 603 grants versus 529 in 2015–2019 (+14% equal-window velocity). Across complete years, output peaked in 2022 at 136 grants and bottomed in 2018 at 94 (+45% peak-over-trough). Lead assignee Traffix Devices, Inc. holds 2.9% of the class ; the top three share 6.8%.

Leaderboard read

E01F concentration, lead at 2.9%

Traffix Devices, Inc. leads this historical grant record at 2.9% of E01F - us corporation assignees hold 64% of class grants (334 of 523). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 2.9%
Top three share: 6.8%
Lead over #2: 10

Where E01F sits inside E01

Among 5 subclasses in E01 (Construction OF Roads, Railways, OR Bridges), E01F ranks #2 and holds 17.4% 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 E01B 981 E01H 971 E01D 612

Rising assignees active in E01F

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 Allied Tube & Conduit Corporation 6.00x 1 → 6 company-wide · 5 in E01F
#2 Vergence Automation, Inc. 5.00x 1 → 5 company-wide · 5 in E01F
#3 Southwest Jiaotong University 4.27x 11 → 47 company-wide · 6 in E01F
#4 Hill & Smith Limited 3.00x 0 → 3 company-wide · 8 in E01F
#5 McCue Corporation 2.80x 5 → 14 company-wide · 11 in E01F

E01F grants by year, peak 2022 (136)

US utility-patent grants per year in E01F, 2015–2025 - recent five years are up 14% versus 2015–2019.

Traffix Devices

37
Lindsay Transportation…

27
Aichi Steel

23
Concaten

20
Geobrugg

12
Valmont Highway…

12
Mccue

11
Neusch Innovations

10
Energy Absorption…

9
Atg Access

8
Hill & Smith

8
Industrial Galvanizers…

8

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.

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

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).

Classes near E01F's 1,276-grant footprint

Nationwide nearest neighbors for E01F (#422 of 670 by volume ; lead share 2.9%) - not the E01 parent-class siblings above.

Nearest by grant volume

H04K 1,274 D06N 1,265 D21F 1,255 B21K 1,246

Nearest by lead-assignee share

F26B 2.9% C12R 2.9% B03B 2.9% B63B 2.9%

Questions about E01F

Which company holds the most patents in E01F?

Traffix Devices, Inc. leads E01F with 37 patents (2.9% of the subclass). By PatentsView assignee type, us corporations account for 64% of class grants.

Which E01F assignees grew fastest recently?

Among assignees with ≥5 grants in E01F, Allied Tube & Conduit Corporation shows the highest company-wide grant multiple (6.00x: 1 grants in 2019–2021 → 6 in 2022–2024) while holding 5 patents in this subclass. Growth is company-wide, not class-only.

How does E01F compare inside parent class E01?

Inside E01 (Construction OF Roads, Railways, OR Bridges), E01F ranks #2 of 5 subclasses by grant volume and holds 17.4% of the parent class total. The largest sibling is E01C (3,503 grants).

What to do with this data

E01F in context - here's where to go next.

Traffix Devices, Inc. leads E01F with 37 grants in this class. See full portfolio
E01F ranks #422 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 - E01F figures are USPTO PatentsView granted-utility totals for this subclass (1,276 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.