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PCE
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DIFF Subgroup
F21V 11/08

using diaphragms containing one or more apertures

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Screens not covered by groups , , or > using diaphragms containing one or more apertures

CPC:

Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 (characterised by cooling arrangements F21V29/502) > using diaphragms containing one or more apertures

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

Child Classifications

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  • F21V 11/10 of iris type IPC+CPC Available in IPC and CPC
  • F21V 11/12 of slot type IPC+CPC Available in IPC and CPC
  • F21V 11/14 with many small apertures IPC+CPC Available in IPC and CPC