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PCE
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DIFF Subgroup
F01L 1/34

characterised by the provision of means for changing the timing of the valves without changing the duration of opening

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Valve-gear or valve arrangements, e.g. lift-valve gear > characterised by the provision of means for changing the timing of the valves without changing the duration of opening

CPC:

Valve-gear or valve arrangements, e.g. lift-valve gear (lift-valve and valve-seat assemblies per se F01L3/00; slide-valve gear F01L5/00; actuated non-mechanically F01L9/00; valve arrangements in working piston or piston rod F01L11/00; modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations F01L13/00) > characterised by the provision of means for changing the timing of the valves without changing the duration of opening

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

IPC defines codes here since 1995.

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