Assertion: silicon carbide's use | /r/HasProperty | controlled by patent
Facets:
value: in many developed countries
type: LOCATION
Source sentences:
text: In many developed countries, the use of moissanite in jewelry was controlled by the patents held by Charles & Colvard; these patents expired in August 2015 for the United States, 2016 in most other countries, and 2018 in Mexico.