Patent Classification Explorer PCE

DIFF Main Group

H03D 13/00

Circuits for comparing the phase or frequency of two mutually-independent oscillations

Introduced: September 1968

Of 4 combined children, 0 exist in both systems.

4 codes are CPC-only extensions.

Child Classifications

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H03D 13/001 +1 CPC CPC only CPC only
H03D 13/003 +1 CPC CPC only CPC only
H03D 13/005 +1 CPC CPC only CPC only
H03D 13/007 +2 CPC CPC only CPC only