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PCE
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DIFF Subgroup
F22B 21/22

built-up from water tubes of form other than straight or substantially straight

Introduced: September 1968

Full Title

Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically > built-up from water tubes of form other than straight or substantially straight

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

Child Classifications

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  • F22B 21/24 bent in serpentine or sinuous form IPC+CPC Available in IPC and CPC
  • F22B 21/26 bent helically, i.e. coiled IPC+CPC Available in IPC and CPC
  • F22B 21/28 bent spirally IPC+CPC Available in IPC and CPC