involving the use of optical projection means, e.g. projection of images on clouds (projection apparatus per se G03B)

Introduced: September 1968

Title

Titles differ between systems:

IPC: involving the use of optical projection means, e.g. projection of images on clouds

CPC: involving the use of optical projection means, e.g. projection of images on clouds (projection apparatus per se G03B)

Full Title

Full titles differ between systems:

IPC:

Advertising or display means not otherwise provided for > using special optical effects > involving the use of optical projection means, e.g. projection of images on clouds

CPC:

Advertising or display means not otherwise provided for > using special optical effects > involving the use of optical projection means, e.g. projection of images on clouds (projection apparatus per se G03B)

No child classifications to compare. This is a leaf node in both IPC and CPC.