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