Arrangements for modifying heat-transfer, e.g. increasing, decreasing (F28F1/00 - F28F11/00 take precedence)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Arrangements for modifying heat transfer, e.g. increasing, decreasing

CPC: Arrangements for modifying heat-transfer, e.g. increasing, decreasing (F28F1/00 - F28F11/00 take precedence)

Full titles differ between systems:

IPC:

Arrangements for modifying heat transfer, e.g. increasing, decreasing

CPC:

Arrangements for modifying heat-transfer, e.g. increasing, decreasing (F28F1/00 - F28F11/00 take precedence)

Of 9 combined children, 6 exist in both systems.

3 codes are CPC-only extensions.

Note: 2 CPC extensions are marked as secondary classification only.

1 shared codes have differing titles between IPC and CPC.

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F28F 13/003 CPC only CPC only
F28F 13/02 by influencing fluid boundary (boundary-layer control in general F15D) IPC+CPC Available in IPC and CPC
F28F 13/04 by preventing the formation of continuous films of condensate on heat-exchange surfaces, e.g. by promoting droplet formation IPC+CPC Available in IPC and CPC
F28F 13/06 by affecting the pattern of flow of the heat-exchange media IPC+CPC Available in IPC and CPC
F28F 13/14 by endowing the walls of conduits with zones of different degrees of conduction of heat IPC+CPC Available in IPC and CPC
F28F 13/16 by applying an electrostatic field to the body of the heat-exchange medium IPC+CPC Available in IPC and CPC
F28F 13/18 by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing +2 CPC IPC+CPC Available in IPC and CPC
F28F 2013/001 2nd only CPC only CPC only
F28F 2013/005 2nd only +2 CPC CPC only CPC only

Class F28,2013–2023, worldwide · Source: EPO PATSTAT

Class F28,2013–2023, worldwide · Source: EPO PATSTAT