using feedback

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Control of position or direction > using feedback

CPC:

Control of position or direction (G05D1/00 takes precedence; numerical control to execute positioning G05B19/18) > using feedback

CPC subdivides this area 3x more granularly than IPC with 3 additional codes.

3 codes are CPC-only extensions.

IPC defines codes here since 1980.

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G05D 3/121 +2 CPC CPC only CPC only
G05D 3/125 +1 CPC CPC only CPC only
G05D 3/128 CPC only CPC only
G05D 3/14 using an analogue comparing device since 1980 +8 CPC IPC+CPC Available in IPC and CPC
G05D 3/20 using a digital comparing device since 1980 +2 CPC IPC+CPC Available in IPC and CPC

Class G05,2013–2023, worldwide · Source: EPO PATSTAT

Class G05,2013–2023, worldwide · Source: EPO PATSTAT