Assertion: pvc | /r/HasProperty | patented
Facets:
value: until 1913
type: TEMPORAL
value: until 1912
type: TEMPORAL
Source sentences:
text: PVC was first prepared by the German chemist August Wilhelm von Hofmann in 1872, but it was not patented until 1912, when another German chemist, Friedrich Heinrich August Klatte, used sunlight to initiate the polymerization of vinyl chloride.
text: PVC was first prepared by the German chemist Eugen Baumann in 1872, but it was not patented until 1913, when Friedrich Heinrich August Klatte used sunlight to initiate the polymerization of vinyl chloride.