Skip to content

Patent Classification Explorer PCE

Search Classifications

Search for IPC and CPC classification codes or keywords

C
C21
C21C
C21C 2100/00
C21C 2100/04

CPC Subgroup Additional Only

C21C 2100/04

Recirculation of the exhaust gas

Full Title

Exhaust gas > Recirculation of the exhaust gas

CPC C21C 2100/04

No direct equivalent in IPC

3 CPC-only subgroups

C21C 2100/02 C21C 2100/06

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

Imprint Privacy mtc.berlin depa.tech patscenar.io

© 2026 mtc.berlin