Imputation of missing inventor country codes in worldwide patent data

The file ctry_inv_person.txt contains identifiers for patent first filings and the inventor (corresponding to appln_id and person_id in PATSTAT) and the country of the inventor. Missing country codes have been imputed from equivalents and other second filings or from information on the county of applicants. It is possible to select certain types of first filings based on column 'type'. For example, Paris Convention priority filings can be retrieved by specifying type='priority'. The field 'source' indicates where the information on inventors' location comes from : 1 = information available from the patent itself, 2 = information availabe from the earliest direct equivalent, 3 = information available from the earliest subsequent filing, 4 = applicants' location from the patent itself, 5 = applicants' location from earliest direct equivalent 6 = applicants' information from earliest subsequent filing. The following 52 patent offices are browsed (EU27 + OECD + BRICS + EPO + WIPO): AL,AT,AU,BE,BG,BR,CA,CH,CL,CN,CY,CZ,DE,DK,EE,EP,ES,FI,FR,GB,GR,HR, HU,IB,IE,IL,IN,IS,IT,JP,KR,LT,LU,LV,MK,MT,MX,NL,NO,NZ,PL,PT,RO,RS,RU,SE,SI,SK,SM,TR,US,ZA.