Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall

Introduced: September 1968

Of 11 combined children, 6 exist in both systems.

5 codes are CPC-only extensions.

5 shared codes have differing titles between IPC and CPC.

Child Classifications

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F28D 7/0008 +2 CPC CPC only CPC only
F28D 7/0041 CPC only CPC only
F28D 7/005 CPC only CPC only
F28D 7/0058 CPC only CPC only
F28D 7/0066 +2 CPC CPC only CPC only
F28D 7/02 the conduits being helically coiled (F28D7/10 takes precedence ) +4 CPC IPC+CPC Available in IPC and CPC
F28D 7/04 the conduits being spirally coiled (F28D7/10 takes precedence) IPC+CPC Available in IPC and CPC
F28D 7/06 the conduits having a single U-bend (F28D7/10 takes precedence) IPC+CPC Available in IPC and CPC
F28D 7/08 the conduits being otherwise bent, e.g. in a serpentine or zig-zag (F28D7/10 takes precedence) +1 CPC IPC+CPC Available in IPC and CPC
F28D 7/10 the conduits being arranged one within the other, e.g. concentrically +2 CPC IPC+CPC Available in IPC and CPC
F28D 7/16 the conduits being arranged in parallel spaced relation (; F28D7/02 - F28D7/10 take precedence) since 1985 +4 CPC IPC+CPC Available in IPC and CPC