CPC technology class · C10

C10C - Working-up Pitch

Working-up pitch, asphalt, bitumen, tar; pyroligneous acid. 264 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

264
US patents granted: #8/10
in C10: 1.0%
C10 class share: +12%
5-yr velocity

The verdict

According to USPTO PatentsView, Working-up Pitch ranks #590 of 670 CPC technology areas - 264 US patents granted since 2015, with recorded grant volume up 12% over five years.

#590
of 670 CPC technology areas: 264
US patents granted, 2015–2025: Mawetal
leading assignee (17): +12%
grant velocity, last 5 yrs

How C10C's grant cadence moved

Between 2020–2024, C10C recorded 121 grants versus 108 in 2015–2019 (+12% equal-window velocity). Across complete years, output peaked in 2015 at 37 grants and bottomed in 2018 at 14 (+164% peak-over-trough). Lead assignee Mawetal LLC holds 6.4% of the class ; the top three share 14.0%.

Leaderboard read

C10C concentration, lead at 6.4%

Mawetal LLC leads this historical grant record at 6.4% of C10C - us corporation assignees hold 70% of class grants (71 of 102). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 6.4%
Top three share: 14.0%
Lead over #2: 3

Where C10C sits inside C10

Among 10 subclasses in C10 (Petroleum, GAS OR Coke INDUSTRIES; Technical Gases Containing Carbon MONOXIDE; FUELS; LUBRICANTS; Peat), C10C ranks #8 and holds 1.0% of the parent class's 27,322 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

C10G 9,942 C10L 5,025 C10M 4,240 C10N 3,834 C10B 1,527 C10J 1,392 C10K 1,080 C10F 12

Rising assignees active in C10C

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 Carbon Holdings Intellectual Properties, LLC 2.60x 5 → 13 company-wide · 14 in C10C
#2 Mawetal LLC 2.11x 9 → 19 company-wide · 17 in C10C
#3 Cenovus Energy Inc. 1.85x 13 → 24 company-wide · 6 in C10C
#4 Total Marketing Services 0.95x 76 → 72 company-wide · 6 in C10C
#5 Ensyn Renewables, Inc. 0.13x 16 → 2 company-wide · 5 in C10C

C10C grants by year, peak 2015 (37)

US utility-patent grants per year in C10C, 2015–2025 - recent five years are up 12% versus 2015–2019.

Mawetal

17
Carbon Holdings…

14
Total Marketing…

6
Cenovus Energy

6
Ensyn Renewables

5
Building Materials…

4
Inaeris

4
Koppers Delaware

4
Graftech International…

3
Kior

3
Soprema

3
Texon

3

What this shows Mawetal is the most active filer in C10C, holding 17 of the 264 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 C10C
Rank	Company	Patents in C10C
#1	Mawetal LLC	17
#2	Carbon Holdings Intellectual Properties, LLC	14
#3	Total Marketing Services	6
#4	Cenovus Energy Inc.	6
#5	Ensyn Renewables, Inc.	5
#6	Building Materials Investment Corporation	4
#7	Inaeris Technologies, LLC	4
#8	Koppers Delaware, Inc.	4
#9	GrafTech International Holdings Inc.	3
#10	KiOR, LLC	3
#11	Soprema	3
#12	Texon LP	3
#13	Blacklidge Emulsions, Inc.	3
#14	Suncor Energy Inc.	2
#15	Syncrude Canada Ltd. in trust for the owners of the Syncrude Project as such owners exist now and in the future	2
#16	Asphalt Sciences LLC	2
#17	Carbovate Development Corp.	2
#18	Sasol Technology Proprietary Limited	1
#19	Roadtec, Inc.	1
#20	Gala Industies, Inc.	1

Footprint here vs. claim strategy

Each dot is a leading C10C 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 C10C assignees by class footprint. Bubble size = patents in C10C. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Questions about C10C

Which company holds the most patents in C10C?

Mawetal LLC leads C10C with 17 patents (6.4% of the subclass). By PatentsView assignee type, us corporations account for 70% of class grants.

Which C10C assignees grew fastest recently?

Among assignees with ≥5 grants in C10C, Carbon Holdings Intellectual Properties, LLC shows the highest company-wide grant multiple (2.60x: 5 grants in 2019–2021 → 13 in 2022–2024) while holding 14 patents in this subclass. Growth is company-wide, not class-only.

How does C10C compare inside parent class C10?

Inside C10 (Petroleum, GAS OR Coke INDUSTRIES; Technical Gases Containing Carbon MONOXIDE; FUELS; LUBRICANTS; Peat), C10C ranks #8 of 10 subclasses by grant volume and holds 1.0% of the parent class total. The largest sibling is C10G (9,942 grants).

What to do with this data

C10C in context - here's where to go next.

Mawetal LLC leads C10C with 17 grants in this class. See full portfolio
C10C ranks #590 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class C10, the largest sibling subclass is C10G with 9,942 grants. Explore C10G

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

Methodology - C10C figures are USPTO PatentsView granted-utility totals for this subclass (264 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.