Patent Classification Explorer PCE

DIFF Main Group

H03G 7/00

Volume compression or expansion in amplifiers

Introduced: September 1968

CPC subdivides this area 3x more granularly than IPC with 4 additional codes.

4 codes are CPC-only extensions.

Child Classifications

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H03G 7/001 CPC only CPC only
H03G 7/002 +2 CPC CPC only CPC only
H03G 7/007 CPC only CPC only
H03G 7/008 CPC only CPC only
H03G 7/02 having discharge tubes IPC+CPC Available in IPC and CPC
H03G 7/06 having semiconductor devices IPC+CPC Available in IPC and CPC