CPC technology class · E01

E01C - Construction Of

Construction of, or surfaces for, roads, sports grounds, or the like; machines or auxiliary tools for construction or repair. 3,503 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

3,503
US patents granted: #1/5
in E01: 47.7%
E01 class share: +1%
5-yr velocity

The verdict

According to USPTO PatentsView, Construction Of ranks #296 of 670 CPC technology areas - 3,503 US patents granted since 2015, with recorded grant volume up 1% over five years.

#296
of 670 CPC technology areas: 3,503
US patents granted, 2015–2025: Caterpillar Paving Products
leading assignee (383): +1%
grant velocity, last 5 yrs

How E01C's grant cadence moved

Between 2020–2024, E01C recorded 1,594 grants versus 1,577 in 2015–2019 (+1% equal-window velocity). Across complete years, output peaked in 2019 at 393 grants and bottomed in 2015 at 268 (+47% peak-over-trough). Lead assignee Caterpillar Paving Products Inc. holds 10.9% of the class ; the top three share 22.8%.

Leaderboard read

E01C concentration, lead at 10.9%

Caterpillar Paving Products Inc. leads this historical grant record at 10.9% of E01C - us corporation assignees hold 58% of class grants (1,294 of 2,221). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 10.9%
Top three share: 22.8%
Lead over #2: 79

Where E01C sits inside E01

Among 5 subclasses in E01 (Construction OF Roads, Railways, OR Bridges), E01C ranks #1 and holds 47.7% 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.

E01F 1,276 E01B 981 E01H 971 E01D 612

Rising assignees active in E01C

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 Bmic LLC 35x 5 → 176 company-wide · 12 in E01C
#2 Research Institute of Highway Ministry of Transport 9.00x 0 → 9 company-wide · 6 in E01C
#3 Sakai Heavy Industries, Ltd. 6.00x 0 → 6 company-wide · 7 in E01C
#4 Brandbumps, LLC 4.00x 1 → 4 company-wide · 14 in E01C
#5 Road Widener LLC 4.00x 1 → 4 company-wide · 6 in E01C

E01C grants by year, peak 2019 (393)

US utility-patent grants per year in E01C, 2015–2025 - recent five years are up 1% versus 2015–2019.

Caterpillar Paving…

383
Wirtgen

304
Bomag

111
Joseph Voegele

98
Hamm

63
Gomaco

33
Schul International

32
Volvo Construction…

31
Roadtec

31
Newpark Mats &…

29
A L M Holding

26
Brock Usa

25

What this shows Caterpillar Paving… is the most active filer in E01C, holding 383 of the 3,503 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 E01C
Rank	Company	Patents in E01C
#1	Caterpillar Paving Products Inc.	383
#2	Wirtgen GmbH	304
#3	Bomag GmbH	111
#4	Joseph Voegele AG	98
#5	Hamm AG	63
#6	Gomaco Corporation	33
#7	Schul International Co., LLC	32
#8	Volvo Construction Equipment AB	31
#9	Roadtec, Inc.	31
#10	Newpark Mats & Integrated Services LLC	29
#11	A.L.M. Holding Company	26
#12	Brock USA, LLC	25
#13	Graco Minnesota Inc.	23
#14	Ergon Asphalt & Emulsions, Inc.	20
#15	Polytex Sportbeläge Produktions-GmbH	20
#16	Moba Mobile Automation AG	18
#17	Integrated Roadways, Inc.	18
#18	Quality MAT Company	18
#19	Somero Enterprises, Inc.	15
#20	Guntert & Zimmerman Const. DIV., Inc.	15

Footprint here vs. claim strategy

Each dot is a leading E01C 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 E01C assignees by class footprint. Bubble size = patents in E01C. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near E01C's 3,503-grant footprint

Nationwide nearest neighbors for E01C (#296 of 670 by volume ; lead share 10.9%) - not the E01 parent-class siblings above.

Nearest by grant volume

B63H 3,529 F02N 3,467 D04H 3,452 A47K 3,567

Nearest by lead-assignee share

E21F 10.9% A01C 11.0% A45D 11.0% G21C 10.9%

Questions about E01C

Which company holds the most patents in E01C?

Caterpillar Paving Products Inc. leads E01C with 383 patents (10.9% of the subclass). By PatentsView assignee type, us corporations account for 58% of class grants.

Which E01C assignees grew fastest recently?

Among assignees with ≥5 grants in E01C, Bmic LLC shows the highest company-wide grant multiple (35x: 5 grants in 2019–2021 → 176 in 2022–2024) while holding 12 patents in this subclass. Growth is company-wide, not class-only.

How does E01C compare inside parent class E01?

Inside E01 (Construction OF Roads, Railways, OR Bridges), E01C ranks #1 of 5 subclasses by grant volume and holds 47.7% of the parent class total. The largest sibling is E01F (1,276 grants).

What to do with this data

E01C in context - here's where to go next.

Caterpillar Paving Products Inc. leads E01C with 383 grants in this class. See full portfolio
E01C ranks #296 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class E01, the largest sibling subclass is E01F with 1,276 grants. Explore E01F

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

Methodology - E01C figures are USPTO PatentsView granted-utility totals for this subclass (3,503 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.