CPC technology class · C08

C08J - Working-up

Working-up; general processes of compounding; after-treatment not covered by subclasses c08b, c08c, c08f, c08g or c08h. 21,338 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

21,338
US patents granted: #5/8
in C08: 14.8%
C08 class share: +18%
5-yr velocity

The verdict

According to USPTO PatentsView, Working-up ranks #97 of 670 CPC technology areas - 21,338 US patents granted since 2015, with recorded grant volume up 18% over five years.

#97
of 670 CPC technology areas: 21,338
US patents granted, 2015–2025: Lg Chem
leading assignee (749): +18%
grant velocity, last 5 yrs

How C08J's grant cadence moved

Between 2020–2024, C08J recorded 10,001 grants versus 8,441 in 2015–2019 (+18% equal-window velocity). Across complete years, output peaked in 2020 at 2,226 grants and bottomed in 2015 at 1,352 (+65% peak-over-trough). Lead assignee LG Chem, Ltd. holds 3.5% of the class ; the top three share 7.3%.

Leaderboard read

C08J concentration, lead at 3.5%

LG Chem, Ltd. leads this historical grant record at 3.5% of C08J - foreign corporation assignees hold 67% of class grants (9,715 of 14,439). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 3.5%
Top three share: 7.3%
Lead over #2: 311

Where C08J sits inside C08

Among 8 subclasses in C08 (Organic Macromolecular COMPOUNDS; Their Preparation OR Chemical WORKING-UP; Compositions Based Thereon), C08J ranks #5 and holds 14.8% 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 C08B 3,742 C08C 1,240 C08H 1,172

Rising assignees active in C08J

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 Resonac Corporation 192x 0 → 192 company-wide · 19 in C08J
#2 Toppan Inc. 56x 0 → 56 company-wide · 11 in C08J
#3 SK Geo Centric Co., Ltd. 35x 0 → 35 company-wide · 5 in C08J
#4 Imam Mohammad IBN Saud Islamic University 27x 0 → 27 company-wide · 9 in C08J
#5 FFI Ionix IP, Inc. 23x 0 → 23 company-wide · 6 in C08J

C08J grants by year, peak 2020 (2,226)

US utility-patent grants per year in C08J, 2015–2025 - recent five years are up 18% versus 2015–2019.

Lg Chem

749
Dow Global

438
Toray Industries

361
Basf Se

330
3m Innovative…

323
Sabic Global B V

177
Mitsubishi Chemical

174
Mitsubishi Gas…

166
Exxonmobil Chemical…

160
Arkema France

151
The Procter & Gamble

148
Zeon

136

What this shows Lg Chem is the most active filer in C08J, holding 749 of the 21,338 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 C08J
Rank	Company	Patents in C08J
#1	LG Chem, Ltd.	749
#2	DOW Global Technologies LLC	438
#3	Toray Industries, Inc.	361
#4	Basf SE	330
#5	3M Innovative Properties Company	323
#6	Sabic Global Technologies B.V.	177
#7	Mitsubishi Chemical Corporation	174
#8	Mitsubishi Gas Chemical Company, Inc.	166
#9	ExxonMobil Chemical Patents Inc.	160
#10	Arkema France	151
#11	The Procter & Gamble Company	148
#12	Zeon Corporation	136
#13	Kuraray Co., Ltd.	134
#14	Kaneka Corporation	131
#15	Borealis AG	131
#16	Daikin Industries, Ltd.	117
#17	Toyobo Co., Ltd.	117
#18	Sekisui Chemical Co., Ltd.	116
#19	Nitto Denko Corporation	115
#20	Xerox Corporation	109

Footprint here vs. claim strategy

Each dot is a leading C08J 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 C08J assignees by class footprint. Bubble size = patents in C08J. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near C08J's 21,338-grant footprint

Nationwide nearest neighbors for C08J (#97 of 670 by volume ; lead share 3.5%) - not the C08 parent-class siblings above.

Nearest by grant volume

H03M 21,338 G11B 21,500 B25J 21,590 B23K 21,060

Nearest by lead-assignee share

A61B 3.5% E06B 3.5% E05Y 3.5% C05D 3.5%

Questions about C08J

Which company holds the most patents in C08J?

LG Chem, Ltd. leads C08J with 749 patents (3.5% of the subclass). By PatentsView assignee type, foreign corporations account for 67% of class grants.

Which C08J assignees grew fastest recently?

Among assignees with ≥5 grants in C08J, Resonac Corporation shows the highest company-wide grant multiple (192x: 0 grants in 2019–2021 → 192 in 2022–2024) while holding 19 patents in this subclass. Growth is company-wide, not class-only.

How does C08J compare inside parent class C08?

Inside C08 (Organic Macromolecular COMPOUNDS; Their Preparation OR Chemical WORKING-UP; Compositions Based Thereon), C08J ranks #5 of 8 subclasses by grant volume and holds 14.8% of the parent class total. The largest sibling is C08L (36,183 grants).

What to do with this data

C08J in context - here's where to go next.

LG Chem, Ltd. leads C08J with 749 grants in this class. See full portfolio
C08J ranks #97 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 - C08J figures are USPTO PatentsView granted-utility totals for this subclass (21,338 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.