PlainPatent

CPC technology class · F04

F04F - Pumping OF Fluid BY Direct Contact OF Another Fluid OR BY…

Pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped ; siphons. 906 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

906
US patents granted
F04
Parent CPC class
20
Active assignees
+21%
5-yr velocity

The verdict

Pumping OF Fluid BY Direct Contact OF Another Fluid OR BY… ranks #471 of 670 CPC technology areas - 906 US patents granted since 2015, with filing up 21% over five years.

#471
of 670 CPC technology areas
906
US patents granted, 2015–2025
Dyson Technology
leading assignee (81)
+21%
filing velocity, last 5 yrs
Top assignee: Dyson Technology Limited (81 patents)

CPC subclass F04F - PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED ; SIPHONS - covers 906 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class F04 (POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS). See our CPC classification guide for how the system works.

The competitive landscape in F04F is shaped by 20 distinct companies actively filing in this space. Dyson Technology Limited leads with 81 patents, followed by Energy Recovery, Inc. at 53 grants and Dayco IP Holdings, Llc at 21.

Filing activity in F04F is up 21% over the past five years versus 2015-2019, a sharp acceleration suggesting an emerging or fast-moving technology area. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is F04F innovation accelerating?

US utility-patent grants per year in F04F, 2015–2025 - recent five years are up 21% versus 2015–2019.

406080100120 20152016201720182019202020212022202320242025 57

Who leads F04F?

The 12 most active assignees in PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED ; SIPHONS - wider bars mean more grants

patents

What this shows Dyson Technology is the most active filer in F04F, holding 81 of the 906 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 F04F
Rank Company Patents in F04F
#1 Dyson Technology Limited 81
#2 Energy Recovery, Inc. 53
#3 Dayco IP Holdings, Llc 21
#4 Ge-hitachi Nuclear Energy Americas Llc 11
#5 Danfoss A/s 9
#6 Delaware Capital Formation, Inc. 7
#7 Q.e.d. Environmental Systems, Inc. 7
#8 Carnot Compression Inc. 7
#9 Flowserve Management Company 6
#10 J.schmalz Gmbh 6
#11 Natural Ocean Well Co. 6
#12 Hamfop Technologies Llc 6
#13 ECP Entwicklungsgesellschaft Mbh 5
#14 GEMA Switzerland Gmbh 5
#15 PIAB Aktiebolag 5
#16 Flowserve Pte. Ltd. 4
#17 Altevac Llc 4
#18 Liftrock, Llc 4
#19 Statoil Petroleum AS 3
#20 TLV Co., Ltd. 3

About This Class

CPC subclass F04F belongs to class F04.

906 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 F04F 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 F04F assignees by class footprint. Bubble size = patents in F04F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 F04F assignees by class footprint. Bubble size = patents in F04F. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 510152025 020406080100 Patents in F04F Avg claims / patent (company-wide) Dyson TechnologyEnergy RecoveryDayco Ip HoldingsGe-hitachi Nuclear En…Danfoss A/SDelaware Capital Form…Q E D Environmental S…Carnot CompressionFlowserve ManagementJ SchmalzNatural Ocean WellHamfopEcp Entwicklungsgesel…Gema Switzerland
Top 14 F04F assignees by class footprint. Bubble size = patents in F04F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class F04F?
CPC subclass F04F covers PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED ; SIPHONS. It belongs to CPC class F04 (POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS), with 906 US utility patents granted since 2015.
How many patents have been filed in F04F?
906 US utility patents were granted in CPC subclass F04F between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in F04F?
Dyson Technology Limited leads F04F with 81 patents, making it the most active assignee in this technology area.
How is patent data for F04F 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., F04) is a broad technology category. Subclasses like F04F 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.