| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F21 | USK | LIGHTING; HEATING |
| F21 | KL | LIGHTING (electric aspects or elements, see section H, e.g. electric light sources H01J , H01K , H05B) |
| F21K | UKL | LIGHT SOURCES NOT OTHERWISE PROVIDED FOR |
| F21K 2/00 | HGR | Light sources using luminescence (luminescent materials C09K 11/00; selection of luminescent materials for light screens F21V 9/16; using excitation by radioactivity G21H 3/02 , H01J 65/06 , H01J 65/08; transforming the wavelength of the light of gas- or vapour-discharge lamps by luminescence H01J 61/42; electroluminescent light sources H05B 33/00) [2, 7] |
| F21K 2/04 | UGR1 | | . | using triboluminescence; using thermoluminescence |
|
| F21K 2/06 | UGR1 | | . | using chemiluminescence [3] |
|
| F21K 2/08 | UGR2 | | . . | activated by an electric field, i.e. electrochemiluminescence [3] |
|
| F21K 5/00 | HGR | Light sources using charges of combustible material, e.g. illuminating flash devices (explosive or thermic compositions C06B; fireworks F42B 4/00; photographic flash units G03B 15/03) [3, 5] |
| F21K 5/04 | UGR1 | | . | Plural charges, e.g. associated for sequential ignition (F21K 5/06 , F21K 5/12 take precedence) [5] |
|
| F21K 5/06 | UGR1 | |
| F21K 5/08 | UGR2 | | . . | Charge held in non-disrupting container, e.g. photo-flash bulb [5] |
|
| F21K 5/10 | UGR3 | | . . . | bearing a coating [5] |
|
| F21K 5/12 | UGR1 | |
| F21K 5/14 | UGR2 | |
| F21K 5/16 | UGR2 | | . . | electrical (circuit arrangements H05B 43/02) [5] |
|
| F21K 5/18 | UGR3 | | . . . | Electrically-ignited primers [5] |
|
| F21K 5/20 | UGR1 | | . | Charge feeding means [5] |
|
| F21K 5/22 | UGR1 | | . | Protective light shields [5] |
|
| F21K 7/00 | HGR | Other light sources |