| F | SK | SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F25 | KL | REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES |
| F25J | UKL | LIQUEFACTION, SOLIDIFICATION, OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT (cryogenic pumps F04B 37/08; gas storage vessels, gas-holders F17; filling vessels with, or discharging from vessels, compressed, liquefied, or solidified gases F17C; refrigeration machines, plants, or systems F25B) |
| F25J 1/00 | HGR | Processes or apparatus for liquefying or solidifying gases or gaseous mixtures |
| F25J 1/02 | UGR1 | | . | requiring the use of refrigeration, e.g. of helium or hydrogen |
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| F25J 3/00 | HGR | Processes or apparatus for separating the constituents of gaseous mixtures involving the use of liquefaction or solidification |
| F25J 3/02 | UGR1 | | . | by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream (F25J 3/08 takes precedence) |
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| F25J 3/04 | UGR2 | |
| F25J 3/06 | UGR1 | |
| F25J 3/08 | UGR1 | | . | Separating gaseous impurities from gases or gaseous mixtures (cold traps B01D 8/00) |
|
| F25J 5/00 | HGR | Arrangements of cold-exchangers or cold-accumulators in separation or liquefaction plants (heat-exchangers F28C, F28D, F28F) |