IPC Definitions - January 01, 2012
G21K 4/00 - Definition
Attention is drawn to the following places, which may be of interest for search:
Photographic processes using X-rays; using screens to intensify X-ray images | G03C 5/16, G03C 5/17 |
In discharge tubes: screens on or from which an image or pattern is formed; luminescent screens | H01J 1/54, H01J 1/62 |
In cathode ray tubes or electron beam tubes: image conversion tubes or image amplification tubes having an X-ray input and an optical output | H01J 31/50 |