Frequency selective networks

Introduced: January 1980

Title

Titles differ between systems:

IPC: Frequency-selective networks

CPC: Frequency selective networks

Full titles differ between systems:

IPC:

Networks using digital techniques > Frequency-selective networks

CPC:

Networks using digital techniques > Frequency selective networks

CPC subdivides this area 6x more granularly than IPC with 9 additional codes.

9 codes are CPC-only extensions.

IPC defines codes here since 1980.

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H03H 17/0201 CPC only CPC only
H03H 17/0202 +5 CPC CPC only CPC only
H03H 17/0211 +3 CPC CPC only CPC only
H03H 17/0219 +2 CPC CPC only CPC only
H03H 17/0223 +7 CPC CPC only CPC only
H03H 17/0248 +10 CPC CPC only CPC only
H03H 17/0283 +3 CPC CPC only CPC only
H03H 17/0294 +2 CPC CPC only CPC only
H03H 17/04 Recursive filters since 1980 +7 CPC IPC+CPC Available in IPC and CPC
H03H 17/06 Non-recursive filters since 1980 +4 CPC IPC+CPC Available in IPC and CPC
H03H 2017/0298 2nd only CPC only CPC only

Class H03,2013–2023, worldwide · Source: EPO PATSTAT

Class H03,2013–2023, worldwide · Source: EPO PATSTAT