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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 grant trajectory.

1,732
US patents granted
#3/4
in F25
7.1%
F25 class share
+5%
5-yr velocity

The verdict

According to USPTO PatentsView, Liquefaction ranks #387 of 670 CPC technology areas - 1,732 US patents granted since 2015, with recorded grant volume up 5% over five years.

#387
of 670 CPC technology areas
1,732
US patents granted, 2015–2025
L'air Liquide Societe…
leading assignee (257)
+5%
grant velocity, last 5 yrs

How F25J's grant cadence moved

Between 2020–2024, F25J recorded 788 grants versus 748 in 2015–2019 (+5% equal-window velocity). Across complete years, output peaked in 2019 at 197 grants and bottomed in 2015 at 101 (+95% peak-over-trough). Lead assignee L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude holds 14.8% of the class ; the top three share 26.9%.

Leaderboard read

F25J concentration, lead at 14.8%

L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude leads this historical grant record at 14.8% of F25J - us corporation assignees hold 54% of class grants (687 of 1,274). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share
14.8%

257 of 1,732 grants

Top three share
26.9%

of the class's recorded grants

Lead over #2
143

more grants than Praxair Technology, Inc.

Where F25J sits inside F25

Among 4 subclasses in F25 (Refrigeration OR COOLING; Combined Heating AND Refrigeration SYSTEMS; Heat Pump SYSTEMS; Manufacture OR Storage OF ICE; Liquefaction Solidification OF Gases), F25J ranks #3 and holds 7.1% of the parent class's 24,410 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

F25B 12,158 F25D 8,866 F25C 1,654

Rising assignees active in F25J

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. #1 Exxon Mobil Technology and Engineering Company 298x 0 → 298 company-wide · 11 in F25J
  2. #2 Hanwha Ocean Co., Ltd. 9.00x 0 → 9 company-wide · 5 in F25J
  3. #3 EnFlex, Inc. 2.67x 3 → 8 company-wide · 11 in F25J
  4. #4 Woodside Energy Technologies Pty Ltd 2.00x 3 → 6 company-wide · 7 in F25J
  5. #5 Bcck Holding Company 2.00x 2 → 4 company-wide · 6 in F25J

F25J grants by year, peak 2019 (197)

US utility-patent grants per year in F25J, 2015–2025 - recent five years are up 5% 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

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). 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…Exxonmobil Upstream…FluorConocophillips8 Rivers CapitalShell Oil CompnyUopChart Energy &…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).

Classes near F25J's 1,732-grant footprint

Nationwide nearest neighbors for F25J (#387 of 670 by volume ; lead share 14.8%) - not the F25 parent-class siblings above.

Nearest by grant volume

F16N 1,760 F23N 1,763 G07B 1,687 B44C 1,788

Nearest by lead-assignee share

F02N 14.7% H03H 15.0% F02C 14.7% B62J 14.6%

Questions about F25J

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 (14.8% of the subclass). By PatentsView assignee type, us corporations account for 54% of class grants.
Which F25J assignees grew fastest recently?
Among assignees with ≥5 grants in F25J, Exxon Mobil Technology and Engineering Company shows the highest company-wide grant multiple (298x: 0 grants in 2019–2021 → 298 in 2022–2024) while holding 11 patents in this subclass. Growth is company-wide, not class-only.
How does F25J compare inside parent class F25?
Inside F25 (Refrigeration OR COOLING; Combined Heating AND Refrigeration SYSTEMS; Heat Pump SYSTEMS; Manufacture OR Storage OF ICE; Liquefaction Solidification OF Gases), F25J ranks #3 of 4 subclasses by grant volume and holds 7.1% of the parent class total. The largest sibling is F25B (12,158 grants).

What to do with this data

F25J in context - here's where to go next.

  • L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude leads F25J with 257 grants in this class. See full portfolio
  • F25J ranks #387 of 670 by grant volume among all tracked CPC technology areas. See the ranking
  • Inside parent class F25, the largest sibling subclass is F25B with 12,158 grants. Explore F25B

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

Methodology - F25J figures are USPTO PatentsView granted-utility totals for this subclass (1,732 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.