PlainPatent

CPC technology class · C02

C02F - Treatment Of Water

Treatment of water, waste water, sewage, or sludge. 14,501 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

14,501
US patents granted
#1/1
in C02
100.0%
C02 class share
+17%
5-yr velocity

The verdict

According to USPTO PatentsView, Treatment Of Water ranks #129 of 670 CPC technology areas - 14,501 US patents granted since 2015, with recorded grant volume up 17% over five years.

#129
of 670 CPC technology areas
14,501
US patents granted, 2015–2025
Ecolab Usa
leading assignee (243)
+17%
grant velocity, last 5 yrs

How C02F's grant cadence moved

Between 2020–2024, C02F recorded 6,837 grants versus 5,823 in 2015–2019 (+17% equal-window velocity). Across complete years, output peaked in 2020 at 1,480 grants and bottomed in 2015 at 930 (+59% peak-over-trough). Lead assignee Ecolab USA Inc. holds 1.7% of the class ; the top three share 4.2%.

Leaderboard read

C02F concentration, lead at 1.7%

Ecolab USA Inc. leads this historical grant record at 1.7% of C02F - us corporation assignees hold 51% of class grants (3,630 of 7,114). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share
1.7%

243 of 14,501 grants

Top three share
4.2%

of the class's recorded grants

Lead over #2
55

more grants than King Fahd University OF Petroleum AND Minerals

Rising assignees active in C02F

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 King Faisal University 125x 6 → 747 company-wide · 37 in C02F
  2. #2 Doosan Enerbility Co., Ltd. 121x 0 → 121 company-wide · 12 in C02F
  3. #3 Imam Mohammad IBN Saud Islamic University 27x 0 → 27 company-wide · 16 in C02F
  4. #4 Mangrove Water Technologies Ltd. 12x 0 → 12 company-wide · 11 in C02F
  5. #5 Natural Ocean Well Co. 12x 1 → 12 company-wide · 9 in C02F

C02F grants by year, peak 2020 (1,480)

US utility-patent grants per year in C02F, 2015–2025 - recent five years are up 17% versus 2015–2019.

8001,0001,2001,4001,600 20152016201720182019202020212022202320242025 1,063

Who leads C02F?

The 12 most active assignees in Treatment OF Water, Waste Water, Sewage, OR Sludge - wider bars mean more grants

patents

What this shows Ecolab Usa is the most active filer in C02F, holding 243 of the 14,501 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 C02F
Rank Company Patents in C02F
#1 Ecolab USA Inc. 243
#2 King Fahd University OF Petroleum AND Minerals 188
#3 Evoqua Water Technologies LLC 177
#4 Saudi Arabian OIL Company 147
#5 Veolia Water Solutions & Technologies Support 82
#6 Kurita Water Industries Ltd. 80
#7 Nanjing University 75
#8 Kemira OYJ 55
#9 Tongji University 54
#10 King Technology, Inc. 52
#11 Doosan Heavy Industries & Construction Co., Ltd. 51
#12 King Abdulaziz University 50
#13 BL Technologies, Inc. 50
#14 Imam Abdulrahman Bin Faisal University 45
#15 Haier US Appliance Solutions, Inc. 41
#16 King Saud University 40
#17 Gradiant Corporation 40
#18 Organo Corporation 39
#19 King Faisal University 37
#20 Coway Co., Ltd. 34

Footprint here vs. claim strategy

Each dot is a leading C02F 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 C02F assignees by class footprint. Bubble size = patents in C02F. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 681012141618 050100150200250300 Patents in C02F Avg claims / patent (company-wide) Ecolab UsaKing Fahd University…Evoqua WaterSaudi Arabian OilVeolia Water…Kurita Water…Nanjing UniversityKemira OyjTongji UniversityKing TechnologyDoosan Heavy…King Abdulaziz…BlImam Abdulrahman Bin…
Top 14 C02F assignees by class footprint. Bubble size = patents in C02F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near C02F's 14,501-grant footprint

Nationwide nearest neighbors for C02F (#129 of 670 by volume ; lead share 1.7%) - not the C02 parent-class siblings above.

Nearest by grant volume

F16C 14,627 G01V 14,307 H01B 14,745 C07F 14,249

Nearest by lead-assignee share

B05B 1.7% B09C 1.7% G01L 1.7% F16M 1.7%

Questions about C02F

Which company holds the most patents in C02F?
Ecolab USA Inc. leads C02F with 243 patents (1.7% of the subclass). By PatentsView assignee type, us corporations account for 51% of class grants.
Which C02F assignees grew fastest recently?
Among assignees with ≥5 grants in C02F, King Faisal University shows the highest company-wide grant multiple (125x: 6 grants in 2019–2021 → 747 in 2022–2024) while holding 37 patents in this subclass. Growth is company-wide, not class-only.

What to do with this data

C02F in context - here's where to go next.

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

Methodology - C02F figures are USPTO PatentsView granted-utility totals for this subclass (14,501 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.