Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point

Child Classifications

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• F25B 9/002 +3 CPC CPC only CPC only
• F25B 9/02 using Joule-Thompson effect; using vortex effect IPC+CPC Available in IPC and CPC
• F25B 9/06 using expanders (F25B9/10 takes precedence) since 1990 +1 CPC IPC+CPC Available in IPC and CPC
• F25B 9/08 using ejectors (F25B9/10 takes precedence) since 1990 IPC+CPC Available in IPC and CPC
• F25B 9/10 with several cooling stages since 1990 IPC+CPC Available in IPC and CPC
• F25B 9/12 using 3He-4He dilution since 1990 IPC+CPC Available in IPC and CPC
• F25B 9/14 characterised by the cycle used, e.g. Stirling cycle since 1990 +1 CPC IPC+CPC Available in IPC and CPC