PCT or International Application Numbers can be entered in either the old (14 character) or new WIPO formats. The old (14 character) format includes a two-digit year and five-character sequence number, i.e. ‘PCT/US99/12345’. The new (17 character) format includes a four digit years, i.e. ‘PCT/US1999/123456’.
PCT/CCYY/99999 or PCT/CCYYYY/999999, where
PCT = “PCT”
CC = 2 character Country Code
YY = last 2 digits of the year filed
YYYY = four digit year filed
99999, 999999 = is the 5 or 6 digit sequence no.
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