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CPC technology class · F04

F04B - Positive-displacement Machines FOR Liquids

Positive-displacement machines for liquids; pumps. 11,585 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

11,585
US patents granted
F04
Parent CPC class
20
Active assignees
+34%
5-yr velocity

The verdict

Positive-displacement Machines FOR Liquids ranks #157 of 670 CPC technology areas - 11,585 US patents granted since 2015, with filing up 34% over five years.

#157
of 670 CPC technology areas
11,585
US patents granted, 2015–2025
Robert Bosch
leading assignee (267)
+34%
filing velocity, last 5 yrs
Top assignee: Robert Bosch Gmbh (267 patents)

CPC subclass F04B - POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS - covers 11,585 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 F04B is shaped by 20 distinct companies actively filing in this space. Robert Bosch Gmbh leads with 267 patents, followed by Graco Minnesota Inc. at 186 grants and Halliburton Energy Services, Inc. at 142.

Filing activity in F04B is up 34% 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 F04B innovation accelerating?

US utility-patent grants per year in F04B, 2015–2025 - recent five years are up 34% versus 2015–2019.

6008001,0001,2001,400 20152016201720182019202020212022202320242025 825

Who leads F04B?

The 12 most active assignees in POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS - wider bars mean more grants

patents

What this shows Robert Bosch is the most active filer in F04B, holding 267 of the 11,585 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 F04B
Rank Company Patents in F04B
#1 DEKA Products Limited Parternship 205
#2 Graco Minnesota Inc. 186
#3 Halliburton Energy Services, Inc. 142
#4 Kabushiki Kaisha Toyota Jidoshokki 140
#5 Microjet Technology Co., Ltd. 136
#6 Caterpillar Inc. 114
#7 Kerr Machine Co. 91
#8 Emerson Climate Technologies, Inc. 89
#9 BJ Energy Solutions, Llc 89
#10 Schlumberger Technology Corporation 82
#11 Eagle Industry Co., Ltd. 81
#12 U.s. Well Services, Llc 66
#13 Hanon Systems 64
#14 Sumitomo Heavy Industries, Ltd. 58
#15 Yantai Jereh Petroleum Equipment & Technologies Co., Ltd. 58
#16 Hitachi Industrial Equipment Systems Co., Ltd. 53
#17 Atlas Copco Airpower, Naamloze Vennootschap 50
#18 Whirlpool S.a. 50
#19 SPM Oil & Gas Inc. 50
#20 Haier US Appliance Solutions, Inc. 46

About This Class

CPC subclass F04B belongs to class F04.

11,585 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 F04B 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 F04B assignees by class footprint. Bubble size = patents in F04B. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 F04B assignees by class footprint. Bubble size = patents in F04B. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 510152025 50100150200250 Patents in F04B Avg claims / patent (company-wide) Deka Products Partern…Graco MinnesotaHalliburton Energy Se…Toyota JidoshokkiMicrojet TechnologyCaterpillarKerr MachineEmerson ClimateBj Energy SolutionsSchlumberger Technolo…Eagle IndustryU S Well ServicesHanon SystemsSumitomo Heavy Indust…
Top 14 F04B assignees by class footprint. Bubble size = patents in F04B. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class F04B?
CPC subclass F04B covers POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS. It belongs to CPC class F04 (POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS), with 11,585 US utility patents granted since 2015.
How many patents have been filed in F04B?
11,585 US utility patents were granted in CPC subclass F04B between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in F04B?
Robert Bosch Gmbh leads F04B with 267 patents, making it the most active assignee in this technology area.
How is patent data for F04B 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 F04B 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.