About: http://webisa.webdatacommons.org/65009380

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	four-year periods, since four years is the most common duration of
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com