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Patent Classification Explorer PCE

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Search for IPC and CPC classification codes or keywords

H
H04
H04L
H04L 19/00

CPC Main Group

H04L 19/00

Apparatus or local circuits for step-by-step systems

CPC H04L 19/00

IPC Equivalent: H04L 19/00

7 CPC-only subgroups

1 IPC-only subgroup

H04L 17/00 H04L 21/00

Data: WIPO (IPC), EPO/USPTO (CPC) — CC BY 4.0

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