DIFF Subgroup
F28F 1/40 the means being only inside the tubular element
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 inside the tubular element
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 inside the tubular element
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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