characterised by the arrangement or form of the flame tubes or combustion chambers

Introduced: January 1980

Full Title

Continuous combustion chambers using liquid or gaseous fuel > characterised by the arrangement or form of the flame tubes or combustion chambers

Of 9 combined children, 8 exist in both systems.

1 codes are CPC-only extensions.

2 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

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F23R 3/425 CPC only CPC only
F23R 3/44 Combustion chambers comprising a tubular flame tube within a tubular casing (reverse-flow combustion chambers F23R3/54) since 1980 IPC+CPC Available in IPC and CPC
F23R 3/46 Combustion chambers comprising an annular arrangement of flame tubes within a common annular casing or within individual casings since 1980 IPC+CPC Available in IPC and CPC
F23R 3/50 Combustion chambers comprising an annular flame tube within an annular casing (toroidal combustion chambers F23R3/52) since 1980 IPC+CPC Available in IPC and CPC
F23R 3/52 Toroidal combustion chambers since 1980 IPC+CPC Available in IPC and CPC
F23R 3/54 Reverse-flow combustion chambers since 1980 IPC+CPC Available in IPC and CPC
F23R 3/56 Combustion chambers having rotary flame tubes since 1980 IPC+CPC Available in IPC and CPC
F23R 3/58 Cyclone or vortex type combustion chambers since 1980 IPC+CPC Available in IPC and CPC
F23R 3/60 Support structures; Attaching or mounting means since 1980 IPC+CPC Available in IPC and CPC

Class F23,2013–2023, worldwide · Source: EPO PATSTAT

Class F23,2013–2023, worldwide · Source: EPO PATSTAT