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PCE
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DIFF Subgroup
F28F 1/32

the means having portions engaging further tubular elements

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Tubular elements; Assemblies of tubular elements > Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses > the means being only outside the tubular element > and extending transversely > the means having portions engaging further tubular elements

CPC:

Tubular elements; Assemblies of tubular elements (specially adapted for movement F28F5/00) > Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses (crimped or corrugated elements F28F1/06, F28F1/08) > the means being only outside the tubular element > and extending transversely (F28F1/38 takes precedence) > the means having portions engaging further tubular elements

Of 1 combined children, 0 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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