F25J LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT
Description
F25J covers apparatus and processes for liquefying, solidifying, or separating gases and gaseous mixtures through combined application of pressure and low-temperature treatment. This subclass encompasses cryogenic separation technologies including rectification columns, heat exchangers, expansion devices, and complete liquefaction plants for industrial gases such as nitrogen, oxygen, argon, and natural gas. The classification includes both the refrigeration systems and mechanical equipment necessary to achieve the required pressure-cold conditions, as well as methods for air separation and purification of gas streams.
Filing statistics
CPC subclass F25J recorded 16,845 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,238 in 2013 to 1,459 in 2023 (+18%), peaking at 1,807 applications in 2016. The most active applicants in class F25 are LG ELECTRONICS (9,415 applications), HAIER SMART HOME (8,015 applications) and MITSUBISHI ELECTRIC CORPORATION (5,758 applications).
Source: EPO PATSTAT, worldwide filings
17 direct subcodes
Child Classifications
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- F25J 1/00 Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J 2200/00 Processes or apparatus using separation by rectification
- F25J 2205/00 Processes or apparatus using other separation and/or other processing means
- F25J 2210/00 Processes characterised by the type or other details of the feed stream
- F25J 2215/00 Processes characterised by the type or other details of the product stream
- F25J 2220/00 Processes or apparatus involving steps for the removal of impurities
- F25J 2230/00 Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J 2235/00 Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
- F25J 2240/00 Processes or apparatus involving steps for expanding of process streams
- F25J 2245/00 Processes or apparatus involving steps for recycling of process streams
- F25J 2250/00 Details related to the use of reboiler-condensers
- F25J 2260/00 Coupling of processes or apparatus to other units; Integrated schemes
- F25J 2270/00 Refrigeration techniques used
- F25J 2280/00 Control of the process or apparatus
- F25J 2290/00 Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J 3/00 Processes or apparatus for separating the constituents of gaseous mixtures involving the use of liquefaction or solidification
- F25J 5/00 Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants (heat exchangers F28C, F28D, F28F)
Top Applicants
Top 10 applicants by patent filingsfor class F25, 2013–2023, worldwide · Source: EPO PATSTAT
- LG ELECTRONICS KR 9,415
- HAIER SMART HOME 8,015
- MITSUBISHI ELECTRIC CORPORATION JP 5,758
- BSH (BOSCH UND SIEMENS HAUSGERAETE) DE 3,827
- MIDEA 3,769
- GREE ELECTRIC APPLIANCES 3,417
- HAIER SMART HOME CN 3,403
- SAMSUNG ELECTRONICS COMPANY KR 3,329
- DAIKIN INDUSTRIES JP 2,908
- HEFEI MIDEA REFRIGERATOR COMPANY 2,186