Projection screens

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Projectors or projection-type viewers; Accessories therefor > Accessories > Projection screens

CPC:

Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00) > Accessories > Projection screens

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

3 codes are CPC-only extensions.

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G03B 21/562 CPC only CPC only
G03B 21/565 CPC only CPC only
G03B 21/567 CPC only CPC only
G03B 21/58 collapsible, e.g. foldable; of variable area IPC+CPC Available in IPC and CPC
G03B 21/60 characterised by the nature of the surface IPC+CPC Available in IPC and CPC