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PCE
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DIFF Subgroup
G02B 5/22

Absorbing filters

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Optical elements other than lenses > Filters > Absorbing filters

CPC:

Optical elements other than lenses (light guides G02B6/00; optical logic elements G02F3/00) > Filters (polarising elements G02B5/30) > Absorbing filters

Of 4 combined children, 2 exist in both systems.

2 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • G02B 5/223 CPC only CPC only
  • G02B 5/226 CPC only CPC only
  • G02B 5/23 Photochromic filters since 1974 IPC+CPC Available in IPC and CPC
  • G02B 5/24 Liquid filters (G02B5/23 takes precedence) IPC+CPC Available in IPC and CPC