| IPC 7 English version |
| F25J-F25J00500 |
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| SECTION F – MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
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| F 25 | REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES |
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| F 25 J | 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) |
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1/ | 00 | Processes or apparatus for liquefying or solidifying gases or gaseous mixtures |
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1/ | 02 | . | requiring the use of refrigeration, e.g. of helium or hydrogen |
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3/ | 00 | Processes or apparatus for separating the constituents of gaseous mixtures involving the use of liquefaction or solidification |
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3/ | 02 | . | 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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3/ | 04 | . | . | for air |
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3/ | 06 | . | by partial condensation (F25J 3/08 takes precedence; by rectification F25J 3/02) |
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3/ | 08 | . | Separating gaseous impurities from gases or gaseous mixtures (cold traps B01D 8/00) |
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5/ | 00 | Arrangements of cold-exchangers or cold-accumulators in separation or liquefaction plants (heat-exchangers F28C, F28D, F28F) |
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