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 grant trajectory.

Compiled by PlainPatent · May 15, 2026

906
US patents granted: #4/4
in F04: 2.6%
F04 class share: +7%
5-yr velocity

The verdict

According to USPTO PatentsView, 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 recorded grant volume up 7% over five years.

#471
of 670 CPC technology areas: 906
US patents granted, 2015–2025: Dyson Technology
leading assignee (81): +7%
grant velocity, last 5 yrs

How F04F's grant cadence moved

Between 2020–2024, F04F recorded 429 grants versus 401 in 2015–2019 (+7% equal-window velocity). Across complete years, output peaked in 2019 at 113 grants and bottomed in 2015 at 51 (+122% peak-over-trough). Lead assignee Dyson Technology Limited holds 8.9% of the class ; the top three share 17.1%.

Leaderboard read

F04F concentration, lead at 8.9%

Dyson Technology Limited leads this historical grant record at 8.9% of F04F - us corporation assignees hold 50% of class grants (191 of 381). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 8.9%
Top three share: 17.1%
Lead over #2: 28

Where F04F sits inside F04

Among 4 subclasses in F04 (Positive - Displacement Machines FOR LIQUIDS; Pumps FOR Liquids OR Elastic Fluids), F04F ranks #4 and holds 2.6% of the parent class's 35,173 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

F04D 16,174 F04B 11,585 F04C 6,508

Rising assignees active in F04F

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 Natural Ocean Well Co. 12x 1 → 12 company-wide · 6 in F04F
#2 Hamfop Technologies LLC 6.00x 0 → 6 company-wide · 6 in F04F
#3 Q.E.D. Environmental Systems, Inc. 2.67x 3 → 8 company-wide · 7 in F04F
#4 Danfoss A/S 1.17x 78 → 91 company-wide · 9 in F04F
#5 J.SCHMALZ GMBH 1.13x 8 → 9 company-wide · 6 in F04F

F04F grants by year, peak 2019 (113)

US utility-patent grants per year in F04F, 2015–2025 - recent five years are up 7% versus 2015–2019.

Dyson Technology

81
Energy Recovery

53
Dayco Ip Holdings

21
Ge-hitachi Nuclear…

11
Danfoss A/S

9
Delaware Capital…

7
Q E D Environmental…

7
Carnot Compression

7
Flowserve Management

6
J Schmalz

6
Natural Ocean Well

6
Hamfop

6

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.

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

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).

Classes near F04F's 906-grant footprint

Nationwide nearest neighbors for F04F (#471 of 670 by volume ; lead share 8.9%) - not the F04 parent-class siblings above.

Nearest by grant volume

D07B 899 F23L 922 F15D 924 F42D 887

Nearest by lead-assignee share

G11B 8.9% G07F 9.0% E06C 9.0% B43K 9.1%

Questions about F04F

Which company holds the most patents in F04F?

Dyson Technology Limited leads F04F with 81 patents (8.9% of the subclass). By PatentsView assignee type, us corporations account for 50% of class grants.

Which F04F assignees grew fastest recently?

Among assignees with ≥5 grants in F04F, Natural Ocean Well Co. shows the highest company-wide grant multiple (12x: 1 grants in 2019–2021 → 12 in 2022–2024) while holding 6 patents in this subclass. Growth is company-wide, not class-only.

How does F04F compare inside parent class F04?

Inside F04 (Positive - Displacement Machines FOR LIQUIDS; Pumps FOR Liquids OR Elastic Fluids), F04F ranks #4 of 4 subclasses by grant volume and holds 2.6% of the parent class total. The largest sibling is F04D (16,174 grants).

What to do with this data

F04F in context - here's where to go next.

Dyson Technology Limited leads F04F with 81 grants in this class. See full portfolio
F04F ranks #471 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class F04, the largest sibling subclass is F04D with 16,174 grants. Explore F04D

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

Methodology - F04F figures are USPTO PatentsView granted-utility totals for this subclass (906 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.