<http://www.openlinksw.com/schemas/linkedin#patent_date> <http://www.w3.org/2000/01/rdf-schema#subPropertyOf> <http://purl.org/dc/elements/1.1/date> . <http://www.openlinksw.com/schemas/linkedin#patent_date> <http://www.w3.org/2000/01/rdf-schema#subPropertyOf> <http://purl.org/dc/terms/date> . <http://www.openlinksw.com/schemas/linkedin#patent_date> <http://www.w3.org/2000/01/rdf-schema#subPropertyOf> <http://dbpedia.org/ontology/Date> .