• All sections
• F - Mechanical engineering; lighting; heating; weapons; blasting
• F21K - Non-electric light sources using luminescence; light sources using electrochemiluminescence; light sources using charges of combustible material; light sources using semiconductor devices as light-generating elements; light sources not otherwise provided for
• F21K 9/232 - Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb

Patent holdings for IPC class F21K 9/232

Total number of patents in this class: 1305

10-year publication summary

Principal owners for this class