| http://www.w3.org/ns/prov#value | - R3, R2 is an ester linking group or an amide linking group, R3 is an alkyl group having from 10 to 22 carbon atoms,...http://www.google.es/patents/US20070180997?utm_source=gb-gplus-sharePatente US20070180997 - Electrets and compounds useful in electrets B???squeda avanzada de patentes N???mero de publicaci???nUS20070180997 A1Tipo de publicaci???nSolicitud N???mero de solicitudUS 11/276,015 Fecha d
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