CPC technology class · E04

E04D - Roof Coverings

Roof coverings; sky-lights; gutters; roof-working tools. 2,409 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

2,409
US patents granted: #6/6
in E04: 8.5%
E04 class share: +8%
5-yr velocity

The verdict

According to USPTO PatentsView, Roof Coverings ranks #350 of 670 CPC technology areas - 2,409 US patents granted since 2015, with recorded grant volume up 8% over five years.

#350
of 670 CPC technology areas: 2,409
US patents granted, 2015–2025: Bmic
leading assignee (149): +8%
grant velocity, last 5 yrs

How E04D's grant cadence moved

Between 2020–2024, E04D recorded 1,140 grants versus 1,056 in 2015–2019 (+8% equal-window velocity). Across complete years, output peaked in 2024 at 259 grants and bottomed in 2021 at 200 (+30% peak-over-trough). Lead assignee Bmic LLC holds 6.2% of the class ; the top three share 16.7%.

Leaderboard read

E04D concentration, lead at 6.2%

Bmic LLC leads this historical grant record at 6.2% of E04D - us corporation assignees hold 83% of class grants (1,325 of 1,599). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 6.2%
Top three share: 16.7%
Lead over #2: 4

Where E04D sits inside E04

Among 6 subclasses in E04 (Building), E04D ranks #6 and holds 8.5% of the parent class's 28,319 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

E04B 7,959 E04H 6,263 E04F 5,179 E04C 3,792 E04G 2,717

Rising assignees active in E04D

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 GAF Energy LLC 55x 1 → 55 company-wide · 38 in E04D
#2 Bmic LLC 35x 5 → 176 company-wide · 149 in E04D
#3 Rockwool A/S 21x 0 → 21 company-wide · 6 in E04D
#4 Continuus Materials Intellectual Property, LLC 9.00x 1 → 9 company-wide · 5 in E04D
#5 Vermont Slate & Copper Services, Inc. 6.00x 0 → 6 company-wide · 13 in E04D

E04D grants by year, peak 2024 (259)

US utility-patent grants per year in E04D, 2015–2025 - recent five years are up 8% versus 2015–2019.

Bmic

149
Certainteed

145
Owens Corning…

108
Vkr Holding A/S

66
Building Materials…

65
Firestone Building…

61
Johns Manville

51
Gutterglove

40
Gaf Energy

38
Sika Technology

26
Holcim Technology

25
Leaffilter North

19

What this shows Bmic is the most active filer in E04D, holding 149 of the 2,409 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 E04D
Rank	Company	Patents in E04D
#1	Bmic LLC	149
#2	CertainTeed LLC	145
#3	Owens Corning Intellectual Capital, LLC	108
#4	VKR Holding A/S	66
#5	Building Materials Investment Corporation	65
#6	Firestone Building Products Company, LLC	61
#7	Johns Manville	51
#8	Gutterglove, Inc.	40
#9	GAF Energy LLC	38
#10	Sika Technology AG	26
#11	Holcim Technology Ltd	25
#12	LeafFilter North, LLC	19
#13	Tamko Building Products LLC	19
#14	SolarCity Corporation	17
#15	RMH Tech LLC	17
#16	Roofers' Advantage Products, LLC	16
#17	Unirac, Inc.	15
#18	Huber Engineered Woods LLC	15
#19	Metal-era, Inc.	14
#20	Carlisle Construction Materials, LLC	13

Footprint here vs. claim strategy

Each dot is a leading E04D 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 E04D assignees by class footprint. Bubble size = patents in E04D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near E04D's 2,409-grant footprint

Nationwide nearest neighbors for E04D (#350 of 670 by volume ; lead share 6.2%) - not the E04 parent-class siblings above.

Nearest by grant volume

G21C 2,434 G04G 2,450 B26B 2,460 G04B 2,356

Nearest by lead-assignee share

H04J 6.2% A47K 6.2% B67B 6.1% B63J 6.3%

Questions about E04D

Which company holds the most patents in E04D?

Bmic LLC leads E04D with 149 patents (6.2% of the subclass). By PatentsView assignee type, us corporations account for 83% of class grants.

Which E04D assignees grew fastest recently?

Among assignees with ≥5 grants in E04D, GAF Energy LLC shows the highest company-wide grant multiple (55x: 1 grants in 2019–2021 → 55 in 2022–2024) while holding 38 patents in this subclass. Growth is company-wide, not class-only.

How does E04D compare inside parent class E04?

Inside E04 (Building), E04D ranks #6 of 6 subclasses by grant volume and holds 8.5% of the parent class total. The largest sibling is E04B (7,959 grants).

What to do with this data

E04D in context - here's where to go next.

Bmic LLC leads E04D with 149 grants in this class. See full portfolio
E04D ranks #350 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class E04, the largest sibling subclass is E04B with 7,959 grants. Explore E04B

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

Methodology - E04D figures are USPTO PatentsView granted-utility totals for this subclass (2,409 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.