Prepayment telephone systems (using a coded card to authorise calls from a telephone set H04M1/675)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Prepayment telephone systems

CPC: Prepayment telephone systems (using a coded card to authorise calls from a telephone set H04M1/675)

Full titles differ between systems:

IPC:

Prepayment telephone systems

CPC:

Prepayment telephone systems (using a coded card to authorise calls from a telephone set H04M1/675)

Preventing unauthorized calling from a telephone set by inserting a coded card

Accounting or billing specially adapted for wireless communication networks Usage measurements specially adapted for wireless communication networks

CPC subdivides this area 13x more granularly than IPC with 12 additional codes.

12 codes are CPC-only extensions.

Note: 6 CPC extensions are marked as secondary classification only.

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H04M 17/005 CPC only CPC only
H04M 17/01 CPC only CPC only
H04M 17/02 Coin-freed or check-freed systems +2 CPC IPC+CPC Available in IPC and CPC
H04M 17/10 +2 CPC CPC only CPC only
H04M 17/20 +3 CPC CPC only CPC only
H04M 17/30 +3 CPC CPC only CPC only
H04M 17/35 CPC only CPC only
H04M 2017/12 2nd only CPC only CPC only
H04M 2017/14 2nd only CPC only CPC only
H04M 2017/22 2nd only +3 CPC CPC only CPC only
H04M 2017/24 2nd only +5 CPC CPC only CPC only
H04M 2017/25 2nd only +4 CPC CPC only CPC only
H04M 2017/26 2nd only CPC only CPC only

Class H04,2013–2023, worldwide · Source: EPO PATSTAT

Class H04,2013–2023, worldwide · Source: EPO PATSTAT