PlainPatent

CPC technology class · B03

B03D - Flotation

Flotation; differential sedimentation. 611 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

611
US patents granted
B03
Parent CPC class
20
Active assignees
+12%
5-yr velocity

The verdict

Flotation ranks #519 of 670 CPC technology areas - 611 US patents granted since 2015, with filing up 12% over five years.

#519
of 670 CPC technology areas
611
US patents granted, 2015–2025
Cidra Corporate Servi…
leading assignee (36)
+12%
filing velocity, last 5 yrs
Top assignee: Cidra Corporate Services Llc (36 patents)

CPC subclass B03D - FLOTATION; DIFFERENTIAL SEDIMENTATION - covers 611 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class B03 (SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTR). See our CPC classification guide for how the system works.

The competitive landscape in B03D is shaped by 20 distinct companies actively filing in this space. Cidra Corporate Services Llc leads with 36 patents, followed by Outotec (finland) OY at 17 grants and Kemira OYJ at 9.

Filing activity in B03D is up 12% over the past five years versus 2015-2019, a relatively steady filing pace. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is B03D innovation accelerating?

US utility-patent grants per year in B03D, 2015–2025 - recent five years are up 12% versus 2015–2019.

3040506070 20152016201720182019202020212022202320242025 38

Who leads B03D?

The 12 most active assignees in FLOTATION; DIFFERENTIAL SEDIMENTATION - wider bars mean more grants

patents

What this shows Cidra Corporate Servi… is the most active filer in B03D, holding 36 of the 611 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 B03D
Rank Company Patents in B03D
#1 Cidra Corporate Services Llc 36
#2 Outotec (finland) OY 17
#3 Kemira OYJ 9
#4 Eriez Manufacturing Co. 9
#5 Central South University 7
#6 Exterran Water Solutions ULC 7
#7 Akzo Nobel Chemicals International B.v 6
#8 Nouryon Chemicals International B.v. 6
#9 Georgia-pacific Chemicals Llc 6
#10 Sanuwave, Inc. 6
#11 VALE S.a. 5
#12 Cytec Technology Corp. 5
#13 ICM, Inc. 5
#14 Anglo American Services (uk) Ltd 5
#15 Kurita Water Industries Ltd. 4
#16 Flsmidth A/s 4
#17 Arr-maz Products, L.p. 4
#18 Newcastle Innovation Limited 4
#19 Veolia Water Solutions & Technologies Support 3
#20 Metso Outotec Finland Oy 3

About This Class

CPC subclass B03D belongs to class B03.

611 patents were granted in this class between 2015 and 2025.

20 companies actively patent in this space.

Classification System

Cooperative Patent Classification (CPC) is a hierarchical patent classification system used by the USPTO and EPO.

← All Technology Classes Technology Rankings →

Footprint here vs. claim strategy

Each dot is a leading B03D 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 B03D assignees by class footprint. Bubble size = patents in B03D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 B03D assignees by class footprint. Bubble size = patents in B03D. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 1015202530 010203040 Patents in B03D Avg claims / patent (company-wide) Cidra Corporate Servi…Outotec (Finland) OyKemira OyjEriez ManufacturingCentral South Univers…Exterran Water Soluti…Akzo Nobel Chemicals…Nouryon Chemicals Int…Georgia-pacific Chemi…SanuwaveValeCytec TechnologyIcmAnglo American Servic…
Top 14 B03D assignees by class footprint. Bubble size = patents in B03D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class B03D?
CPC subclass B03D covers FLOTATION; DIFFERENTIAL SEDIMENTATION. It belongs to CPC class B03 (SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTR), with 611 US utility patents granted since 2015.
How many patents have been filed in B03D?
611 US utility patents were granted in CPC subclass B03D between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in B03D?
Cidra Corporate Services Llc leads B03D with 36 patents, making it the most active assignee in this technology area.
How is patent data for B03D collected?
Patent data comes from USPTO PatentsView, a public research dataset maintained by the United States Patent and Trademark Office. It covers all US granted utility patents and assigns CPC codes based on the technology described in each patent.
What is the difference between CPC class and subclass?
A CPC class (e.g., B03) is a broad technology category. Subclasses like B03D provide finer granularity within that category. PlainPatent organizes data at the subclass level (4-character codes) for the most useful view of technology domains.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial

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.