(source: https://www.rsc.org/periodic-table/element/74/tungsten)

Tungsten was used extensively for the filaments of old-style incandescent light bulbs: Electric Incandescence Lamp with Filament of Metallic Tungsten (1906).

Tungsten and its alloys are used in many high-temperature applications, such as arc-welding electrodes: Nonconsumable Tungsten Electrode For Arc Welding (1973).

Tungsten carbide is immensely hard. It makes excellent cutting and drilling tools: Improvements relating to cutting tools having tips or inserts of tungsten carbide or like hard materials (1941).

Calcium and magnesium tungstates are widely used in luminescence applications:


All patent information has been obtained from Espacenet (European Patent Office).