Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Ventilation of mines or tunnels; Distribution of ventilating currents

CPC: Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F)

Full titles differ between systems:

IPC:

Ventilation of mines or tunnels; Distribution of ventilating currents

CPC:

Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F)

Of 9 combined children, 7 exist in both systems.

2 codes are CPC-only extensions.

6 shared codes have differing titles between IPC and CPC.

Navigate with arrow keys, Enter to open

E21F 1/003 CPC only CPC only
E21F 1/006 CPC only CPC only
E21F 1/02 Test models (analogue computers therefor G06G7/50) IPC+CPC Available in IPC and CPC
E21F 1/04 Air ducts (suspension devices E21F17/02) IPC+CPC Available in IPC and CPC
E21F 1/08 Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators (; ventilators in general F04D) +1 CPC IPC+CPC Available in IPC and CPC
E21F 1/10 Air doors (; doors in general E06B) IPC+CPC Available in IPC and CPC
E21F 1/14 Air partitions; Air locks (; dams E21F17/103; air locks for foundations E02D) +1 CPC IPC+CPC Available in IPC and CPC
E21F 1/16 Shaft covers IPC+CPC Available in IPC and CPC
E21F 1/18 Gravity flow ventilation (E21F1/02 - E21F1/16 take precedence) since 1974 IPC+CPC Available in IPC and CPC

Class E21,2013–2023, worldwide · Source: EPO PATSTAT

Class E21,2013–2023, worldwide · Source: EPO PATSTAT