unclassified dsti doc 2004 2 organisation de coopération et développement economiques for economic co operation and development 17 mar ___________________________________________________________________________________________ english text only directorate science technology industry triadic patent families methodology sti working paper statistical analysis of hélène dernis mosahid khan jt00160184 document complet disponible sur olis dans son format d origine complete available on in its original un cl assi fi ed e n gl i s h l y series the oecd is designed to make a wider readership selected studies prepared by staff or outside consultants projects papers included cover broad range issues both technical policy analytical nature areas work are generally their language french with summary other comments invited should be sent