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built-up from water tubes arranged in a comparatively long vertical shaft, i.e. tower boilers

built-up from water tubes arranged in a comparatively long vertical shaft, i.e. tower boilers · Cooperative Patent Classification (CPC)

Engines, pumps, lighting, heating, and mechanical systems.

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CPC classification statistics
Metric	Value
CPC code	F22B21/40
Official title	built-up from water tubes arranged in a comparatively long vertical shaft, i.e. tower boilers
Display label	built-up from water tubes arranged in a comparatively long vertical shaft, i.e. tower boilers
Total patents	7

Year-over-year patent counts classified under this CPC code.

Filing activity over the last five years is stable.

Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.