مساعدة


WO (PCT) publication numbers

The format of PCT (WO) publication numbers from 1978 until 30/06/2002 was WOyynnnnn (2 year digits and 5 numerics). Then the format changed from 1/7/2002 until 31/12/2003 and was WOyynnnnnn (2 years and 6 numerics) and since 1/1/2004 the format is WOyyyynnnnnn (4 year digits and 6 numerics).


For more information on patent number formats, see the following pages: