Automatic control ( combined with volume compression or expansion H03G7/00)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Automatic control

CPC: Automatic control ( combined with volume compression or expansion H03G7/00)

Full titles differ between systems:

IPC:

Gain control in amplifiers or frequency changers > Automatic control

CPC:

Gain control in amplifiers or frequency changers > Automatic control ( combined with volume compression or expansion H03G7/00)

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

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H03G 3/22 in amplifiers having discharge tubes +1 CPC IPC+CPC Available in IPC and CPC
H03G 3/30 in amplifiers having semiconductor devices +6 CPC IPC+CPC Available in IPC and CPC

Class H03,2013–2023, worldwide · Source: EPO PATSTAT

Class H03,2013–2023, worldwide · Source: EPO PATSTAT