(source: https://www.rsc.org/periodic-table/element/90/thorium)

Thorium alloys have many applications; thorium-tungsten, and thorium-molybdenum alloys are used for thermoelectronic  emitter filaments: Thorium alloys and methods of preparing the same (1927).

Thorium additions confer improved high temperature properties to magnesium: A method of preparing a magnesium thorium alloy (1961). Copper-nickel-thorium alloys are resistant to mechanical stress and chemical attack.

There has been growing interest over many years in thorium as a fuel in nuclear reactors:


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