PlainPatent

CPC technology class · F25

F25J - Liquefaction

Liquefaction, solidification or separation of gases or gaseous ; or liquefied gaseous; mixtures by pressure and cold treatment ; or by bringing them into the supercritical state. 1,732 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

1,732
US patents granted
F25
Parent CPC class
20
Active assignees
+21%
5-yr velocity

The verdict

Liquefaction ranks #387 of 670 CPC technology areas - 1,732 US patents granted since 2015, with filing up 21% over five years.

#387
of 670 CPC technology areas
1,732
US patents granted, 2015–2025
L'air Liquide Societe…
leading assignee (257)
+21%
filing velocity, last 5 yrs
Top assignee: L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude (257 patents)

CPC subclass F25J - LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS ; OR LIQUEFIED GASEOUS; MIXTURES BY PRESSURE AND COLD TREATMENT ; OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE - covers 1,732 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class F25 (REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES). See our CPC classification guide for how the system works.

The competitive landscape in F25J is shaped by 20 distinct companies actively filing in this space. L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude leads with 257 patents, followed by Praxair Technology, Inc. at 114 grants and Linde Gmbh at 95.

Filing activity in F25J 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 F25J innovation accelerating?

US utility-patent grants per year in F25J, 2015–2025 - recent five years are up 21% versus 2015–2019.

50100150200250 20152016201720182019202020212022202320242025 115

Who leads F25J?

The 12 most active assignees in LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS ; OR LIQUEFIED GASEOUS; MIXTURES BY PRESSURE AND COLD TREATMENT ; OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE - wider bars mean more grants

patents

What this shows L'air Liquide Societe… is the most active filer in F25J, holding 257 of the 1,732 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 F25J
Rank Company Patents in F25J
#1 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude 257
#2 Praxair Technology, Inc. 114
#3 Linde Gmbh 95
#4 AIR Products AND Chemicals, Inc. 73
#5 Exxonmobil Upstream Research Company 69
#6 Fluor Technologies Corporation 36
#7 Conocophillips Company 32
#8 8 Rivers Capital, Llc 30
#9 Shell OIL Compny 28
#10 UOP Llc 27
#11 Chart Energy & Chemicals, Inc. 25
#12 Ortloff Engineers, Ltd. 23
#13 Daewoo Shipbuilding & Marine Engineering Co., Ltd. 22
#14 Lummus Technology Llc 20
#15 Technip France 17
#16 Sustainable Energy Solutions, Inc. 17
#17 S.m.e. Products Lp 17
#18 JGC Corporation 13
#19 1304338 Alberta Ltd. 12
#20 1304342 Alberta Ltd. 12

About This Class

CPC subclass F25J belongs to class F25.

1,732 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 F25J 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 F25J assignees by class footprint. Bubble size = patents in F25J. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 F25J assignees by class footprint. Bubble size = patents in F25J. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 1015202530 0100200300 Patents in F25J Avg claims / patent (company-wide) L'air Liquide Societe…Praxair TechnologyLindeAir Products And Chem…Exxonmobil Upstream R…FluorConocophillips8 Rivers CapitalShell Oil CompnyUopChart Energy & Chemic…Ortloff EngineersDaewoo Shipbuilding &…Lummus Technology
Top 14 F25J assignees by class footprint. Bubble size = patents in F25J. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class F25J?
CPC subclass F25J covers LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS ; OR LIQUEFIED GASEOUS; MIXTURES BY PRESSURE AND COLD TREATMENT ; OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE. It belongs to CPC class F25 (REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES), with 1,732 US utility patents granted since 2015.
How many patents have been filed in F25J?
1,732 US utility patents were granted in CPC subclass F25J between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in F25J?
L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude leads F25J with 257 patents, making it the most active assignee in this technology area.
How is patent data for F25J 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., F25) is a broad technology category. Subclasses like F25J 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.