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PCE
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DIFF Subgroup
G03B 27/72

Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

Introduced: September 1968

Full Title

Photographic printing apparatus > Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

Of 6 combined children, 3 exist in both systems.

3 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • G03B 27/722 CPC only CPC only
  • G03B 27/725 CPC only CPC only
  • G03B 27/727 CPC only CPC only
  • G03B 27/74 Positioning exposure meters in the apparatus IPC+CPC Available in IPC and CPC
  • G03B 27/80 in dependence upon automatic analysis of the original (G03B27/73 takes precedence) since 1980 IPC+CPC Available in IPC and CPC