• All sections
• F - Mechanical engineeringlightingheatingweaponsblasting
• F21K - Non-electric light sources using luminescencelight sources using electrochemiluminescencelight sources using charges of combustible materiallight sources using semiconductor devices as light-generating elementslight sources not otherwise provided for
• F21K 9/27 - Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes

Patent holdings for IPC class F21K 9/27

Total number of patents in this class: 357

10-year publication summary

Principal owners for this class