Arrangements for supplying or controlling air or other gases for drying solid materials or objects

Introduced: September 1968

Of 7 combined children, 4 exist in both systems.

3 codes are CPC-only extensions.

IPC defines codes here since 2026.

Child Classifications

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F26B 21/001 +1 CPC CPC only CPC only
F26B 21/003 CPC only CPC only
F26B 21/006 +2 CPC CPC only CPC only
F26B 21/20 Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure since 2026 +1 CPC IPC+CPC Available in IPC and CPC
F26B 21/30 Controlling, e.g. regulating, parameters of gas supply since 2026 IPC+CPC Available in IPC and CPC
F26B 21/40 using gases other than air since 2026 +1 CPC IPC+CPC Available in IPC and CPC
F26B 21/50 Ducting arrangements from the source of air or other gases to the materials or objects being dried since 2026 IPC+CPC Available in IPC and CPC