PlainPatent

CPC technology class · C08

C08C - Treatment Or Chemical Modification Of Rubbers

Treatment or chemical modification of rubbers. 1,240 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

1,240
US patents granted
#7/8
in C08
0.9%
C08 class share
-19%
5-yr velocity

The verdict

According to USPTO PatentsView, Treatment Or Chemical Modification Of Rubbers ranks #428 of 670 CPC technology areas - 1,240 US patents granted since 2015, with recorded grant volume down 19% over five years.

#428
of 670 CPC technology areas
1,240
US patents granted, 2015–2025
Bridgestone
leading assignee (150)
-19%
grant velocity, last 5 yrs

How C08C's grant cadence moved

Between 2020–2024, C08C recorded 480 grants versus 594 in 2015–2019 (-19% equal-window velocity). Across complete years, output peaked in 2017 at 132 grants and bottomed in 2023 at 68 (+94% peak-over-trough). Lead assignee Bridgestone Corporation holds 12.1% of the class ; the top three share 23.6%.

Leaderboard read

C08C concentration, lead at 12.1%

Bridgestone Corporation leads this historical grant record at 12.1% of C08C - foreign corporation assignees hold 85% of class grants (679 of 802). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share
12.1%

150 of 1,240 grants

Top three share
23.6%

of the class's recorded grants

Lead over #2
74

more grants than Sumitomo Rubber Industries, Ltd.

Where C08C sits inside C08

Among 8 subclasses in C08 (Organic Macromolecular COMPOUNDS; Their Preparation OR Chemical WORKING-UP; Compositions Based Thereon), C08C ranks #7 and holds 0.9% of the parent class's 144,472 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

C08L 36,183 C08G 29,133 C08K 28,505 C08F 23,159 C08J 21,338 C08B 3,742 C08H 1,172

Rising assignees active in C08C

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. #1 Eneos Materials Corporation 12x 0 → 12 company-wide · 9 in C08C
  2. #2 Natural Fiber Welding, Inc. 2.80x 5 → 14 company-wide · 14 in C08C
  3. #3 Trinseo Europe GMBH 1.67x 15 → 25 company-wide · 12 in C08C
  4. #4 Korea Kumho Petrochemical Co., Ltd. 1.36x 14 → 19 company-wide · 8 in C08C
  5. #5 Continental Reifen Deutschland GmbH 0.99x 91 → 90 company-wide · 10 in C08C

C08C grants by year, peak 2017 (132)

US utility-patent grants per year in C08C, 2015–2025 - recent five years are down 19% versus 2015–2019.

6080100120140 20152016201720182019202020212022202320242025 64

Who leads C08C?

The 12 most active assignees in Treatment OR Chemical Modification OF Rubbers - wider bars mean more grants

patents

What this shows Bridgestone is the most active filer in C08C, holding 150 of the 1,240 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 C08C
Rank Company Patents in C08C
#1 Bridgestone Corporation 150
#2 Sumitomo Rubber Industries, Ltd. 76
#3 Zeon Corporation 67
#4 Compagnie Generale DES Etablissements Michelin 61
#5 Arlanxeo Deutschland GmbH 51
#6 The Yokohama Rubber Co., Ltd. 47
#7 The Goodyear Tire & Rubber Company 44
#8 Michelin Recherche ET Technique S.A. 31
#9 JSR Corporation 25
#10 Lanxess Deutschland GmbH 17
#11 Asahi Kasei Chemicals Corporation 14
#12 Natural Fiber Welding, Inc. 14
#13 Versalis S.P.A. 13
#14 Fina Technology, Inc. 12
#15 Trinseo Europe GMBH 12
#16 Continental Reifen Deutschland GmbH 10
#17 Toyo Tire & Rubber Co., Ltd. 9
#18 Eneos Materials Corporation 9
#19 Korea Kumho Petrochemical Co., Ltd. 8
#20 Molecular Rebar Design, LLC 8

Footprint here vs. claim strategy

Each dot is a leading C08C 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 C08C assignees by class footprint. Bubble size = patents in C08C. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 510152025 050100150200 Patents in C08C Avg claims / patent (company-wide) BridgestoneSumitomo Rubber…ZeonCompagnie Generale…Arlanxeo DeutschlandThe Yokohama RubberThe Goodyear Tire &…Michelin Recherche Et…JsrLanxess DeutschlandAsahi Kasei ChemicalsNatural Fiber WeldingVersalis S P AFina Technology
Top 14 C08C assignees by class footprint. Bubble size = patents in C08C. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near C08C's 1,240-grant footprint

Nationwide nearest neighbors for C08C (#428 of 670 by volume ; lead share 12.1%) - not the C08 parent-class siblings above.

Nearest by grant volume

B63C 1,244 B21K 1,246 D06P 1,234 B04B 1,233

Nearest by lead-assignee share

C09G 12.1% G06G 12.1% B25C 12.0% B60D 12.3%

Questions about C08C

Which company holds the most patents in C08C?
Bridgestone Corporation leads C08C with 150 patents (12.1% of the subclass). By PatentsView assignee type, foreign corporations account for 85% of class grants.
Which C08C assignees grew fastest recently?
Among assignees with ≥5 grants in C08C, Eneos Materials Corporation shows the highest company-wide grant multiple (12x: 0 grants in 2019–2021 → 12 in 2022–2024) while holding 9 patents in this subclass. Growth is company-wide, not class-only.
How does C08C compare inside parent class C08?
Inside C08 (Organic Macromolecular COMPOUNDS; Their Preparation OR Chemical WORKING-UP; Compositions Based Thereon), C08C ranks #7 of 8 subclasses by grant volume and holds 0.9% of the parent class total. The largest sibling is C08L (36,183 grants).

What to do with this data

C08C in context - here's where to go next.

  • Bridgestone Corporation leads C08C with 150 grants in this class. See full portfolio
  • C08C ranks #428 of 670 by grant volume among all tracked CPC technology areas. See the ranking
  • Inside parent class C08, the largest sibling subclass is C08L with 36,183 grants. Explore C08L

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

Methodology - C08C figures are USPTO PatentsView granted-utility totals for this subclass (1,240 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.