the means being integral with the element, e.g. formed by extrusion (F28F1/22 takes precedence)

Introduced: September 1968

Title

Titles differ between systems:

IPC: the means being integral with the element, e.g. formed by extrusion

CPC: the means being integral with the element, e.g. formed by extrusion (F28F1/22 takes precedence)

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 longitudinally > the means being integral with the element, e.g. formed by extrusion

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 longitudinally (F28F1/38 takes precedence) > the means being integral with the element, e.g. formed by extrusion (F28F1/22 takes precedence)

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

Child Classifications

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F28F 1/18 the element being built-up from finned sections IPC+CPC Available in IPC and CPC