characterised by the use of electric means

Introduced: September 1968

Full Title

Control of temperature > characterised by the use of electric means

CPC subdivides this area 3x more granularly than IPC with 7 additional codes.

7 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

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G05D 23/1902 +2 CPC CPC only CPC only
G05D 23/1906 +3 CPC CPC only CPC only
G05D 23/1917 CPC only CPC only
G05D 23/1919 +4 CPC CPC only CPC only
G05D 23/1925 CPC only CPC only
G05D 23/1927 +2 CPC CPC only CPC only
G05D 23/1951 CPC only CPC only
G05D 23/20 with sensing elements having variation of electric or magnetic properties with change of temperature (G05D23/13 takes precedence) +2 CPC IPC+CPC Available in IPC and CPC
G05D 23/27 with sensing element responsive to radiation IPC+CPC Available in IPC and CPC
G05D 23/275 with sensing element expanding, contracting, or fusing in response to changes of temperature +1 CPC IPC+CPC Available in IPC and CPC
G05D 23/30 Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature +1 CPC IPC+CPC Available in IPC and CPC