• All sections
• F - Mechanical engineering; lighting; heating; weapons; blasting
• F21V - Functional features or details of lighting devices or systems thereof; structural combinations of lighting devices with other articles, not otherwise provided for
• F21V 9/40 - Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity

Patent holdings for IPC class F21V 9/40

Total number of patents in this class: 413

10-year publication summary

Principal owners for this class