Processes or apparatus for separating the constituents of gaseous mixtures involving the use of liquefaction or solidification

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:: REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
Subclass:: LIQUEFACTION, SOLIDIFICATION, OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT

Filing statistics

IPC F25J 3/00 belongs to the parent subclass F25J, which recorded 16,536 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,165 in 2013 to 1,617 in 2023 (+39%), peaking at 1,899 applications in 2022. The most active applicants in class F25 are HAIER SMART HOME (13,215 applications), LG ELECTRONICS (8,561 applications) and MIDEA (7,315 applications).

Source: EPO PATSTAT, worldwide filings

Related Keywords

separating gases by use of LIQUEFACTIONseparating gases by SOLIDIFYING

3 direct subcodes

Child Classifications

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F25J 3/02 by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
F25J 3/06 by partial condensation
F25J 3/08 Separating gaseous impurities from gases or gaseous mixtures

Top Applicants

Top 10 applicants by patent filingsfor class F25, 2013–2023, worldwide · Source: EPO PATSTAT

HAIER SMART HOME 13,215
LG ELECTRONICS KR 8,561
MIDEA 7,315
GREE ELECTRIC APPLIANCES 6,041
HEFEI MIDEA REFRIGERATOR COMPANY 5,211
MITSUBISHI ELECTRIC CORPORATION JP 4,905
HEFEI HUALING COMPANY 4,633
BSH (BOSCH UND SIEMENS HAUSGERAETE) DE 3,697
QINGDAO HAIER INTELLIGENT TECHNOLOGY RESEARCH ANDDEVELOPMENT COMPANY 3,376
HAIER SMART HOME CN 3,265