PCT Contracting States are:

CODE COUNTRY DATE RO (language of the application-language of the request)
United Arab Emirates 10/03/1999 IB (all-all)
AG Antigua-and-Barbuda 17/03/2000 ?
AL Albania 04/10/1995 AL (Albanian or English-English) – EP (English German French-English German French)
AM Armenia 25/12/1991 AM (English-English) – EA (English Russian-English Russian)
AO Angola 27/12/2007 IB (all-all)
AT Austria 23/04/1979 AT (German French or English-German French or English) – EP (English German French-English German French)
AU Australia 31/03/1980 AU (English or translation-English)
AZ Azerbaijan 25/12/1995 AZ (English Azerbaijani Russian-English Russian) – EA (English Russian-English Russian)
BA Bosnia and Herzegovina 07/09/1996 BA (English-English)
BB Barbados 12/03/1985 IB (all-all)
BE Belgium 14/12/1981 BE (German English French or Dutch-German English or French) – EP (English German French-English German French)
BF Burkina Faso 21/03/1989 OA (English French-English French)
BG Bulgaria 21/05/1984 BG (English Bulgarian Russian or translation-English Russian) – EP (English German French-English German French)
BH Bahrain 18/03/2007 BH (English Arabic or translation-English Arabic)
BJ Benin 26/02/1987 OA (English French-English French)
BN Brunei Darussalam 24/07/2012 BN (English-English)
BR Brazil 09/04/1978 BR (English Spanish Portuguese-English Spanish Portuguese)
BW Botswana 30/10/2003 AP (English-?) – BW (English-English)
BY Belarus 25/12/1991 BY (English Russian-English Russian) – EA (English Russian-English Russian)
BZ Belize 17/06/2000 BZ (English-English)
CA Canada 02/01/1990 CA (English French-English French)
CF Central African Republic 24/01/1978 OA (English French-English French)
CG Congo 24/01/1978 OA (English French-English French)
CH Switzerland 24/01/1978 CH (German English French-German English French) – EP (English German French-English German French)
CI Côte d’Ivoire 30/04/1991 OA (English French-English French)
CL Chile 02/06/2009 CL (Spanish-Spanish)
CM Cameroon 24/01/1978 OA (English French-English French)
CN China 01/01/1994 CN (English Chinese-English Chinese)
CO Colombia 28/02/2001 CO (Spanish-Spanish)
CR Costa Rica 03/08/1999 CR (Spanish-?)
CU Cuba 16/07/1996 CU (Spanish-Spanish)
CY Cyprus 01/04/1998 CY (German French English Greek or translation-?) – EP (English German French-English German French)
CZ Czech Republic 01/01/1993 CZ (German French English Czech or translation-German English French) – EP (English German French-English German French)
DE Germany 24/01/1978 DE (German-German) – EP (English German French-English German French)
DK Denmark 01/12/1978 DK (German English Danish French Icelandic Norwegian Swedish-German English French) – EP (English German French-English German French)
DM Dominica 07/08/1999 ?
DO Dominican Republic 28/05/2007 DO (Spanish-?)
DZ Algeria 08/03/2000 DZ (Arabic French-Arabic French)
EC Ecuador 07/05/2001 EC (Spanish-Spanish)
EE Estonia 24/08/1994 EE (German French-German French) – EP (English German French-English German French)
EG Egypt 06/09/2003 EG (English Arabic-English Arabic)
ES Spain 16/11/1989 EP (English German French-English German French) – ES (Spanish-Spanish)
FI Finland 01/10/1980 EP (English German French-English German French) – FI (English Finnish Swedish-English)
FR France 25/02/1978 EP (English German French-English German French) – FR (French-?)
GA Gabon 24/01/1978 OA (English French-English French)
GB United Kingdom 24/01/1978 EP (English German French-English German French) – GB (English Welsh-English)
GD Grenada 22/09/1998 ?
GE Georgia 25/12/1991 GE (English Georgian Russian-English Russian)
GH Ghana 26/02/1997 AP (English-?) – GH (English-?)
GM Gambia 09/12/1997 AP (English-?)
GN Guinea 27/05/1991 OA (English French-English French)
GQ Equatorial Guinea 17/07/2001 OA (English French-English French)
GR Greece 09/10/1990 EP (English German French-English German French) – GR (English German French-English German French)
GT Guatemala 14/10/2006 GT (Spanish-Spanish)
GW Guinea-Bissau 12/12/1997 OA (English French-English French)
HN Honduras 20/06/2006 HN (Spanish-Spanish)
HR

Croatia

01/07/1998 EP (English German French-English German French) – HR (English Croatian-English)
HU Hungary 27/06/1980 EP (English German French-English German French) – HU (English German French Hungarian Russian-English German French Russian)
ID Indonesia 05/09/1997 ID (English-English)
IE Ireland 01/08/1992 EP (English German French-English German French) – IE (English-English)
IL Israel 01/06/1996 IL (English-English)
IN India 07/12/1998 IN (English or Hindi-English)
IR Islamic Republic of Iran 04/10/2013 ?
IS Iceland 23/03/1995 EP (English German French-English German French) – IS (English Danish Norwegian Swedish-English)
IT Italy 28/03/1985 EP (English German French-English German French) – IT (German English French Italian-English German French)
JP Japan 01/10/1978 JP (English Japanese-English Japanese)
KE Kenya 08/06/1994 AP (English-?) – KE (English-English)
KG Kyrgyzstan 25/12/1991 EA (English Russian-English Russian) – KG (English Russian-English Russian)
KM Comoros 03/04/2005 OA (English French-English French)
KN Saint Kitts and Nevis 27/10/2005 ?
KP Democratic People’s Republic of Korea 08/07/1980 KP (English Korean French Russian-?)
KR Republic of Korea 10/08/1984 KR (English Korean Japanese-English Korean Japanese)
KZ Kazakhstan 25/12/1991 EA (English Russian-English Russian) – KZ (English Russian-English Russian)
LA Lao People’s Democratic Republic 14/06/2006 IB (all-all)
LC Saint Lucia 30/08/1996 IB (all-all)
LI Liechtenstein 19/03/1980 CH (German English French-German English French) – EP (English German French-English German French)
LK Sri Lanka 26/02/1982 IB (all-all)
LR Liberia 27/08/1994 AP (English-?) – LR (English-?)
LS Lesotho 21/10/1995 AP (English-?) – LS (English-English)
LT Lithuania 05/07/1994 EP (English German French-English German French) – LT (English Lithuanian Russian-English Russian)
LU Luxembourg 30/04/1978 EP (English German French-English German French) – LU (German French-?)
LV Latvia 07/09/1993 EP (English German French-English German French) – LV (English German French Latvian Russian-English German French Russian)
LY Libya 15/09/2005 LY (Arabic English-Arabic English)
MA Morocco 08/10/1999 MA (French-French)
MC Monaco 22/06/1979 EP (English German French-English German French) – MC (French-French)
MD Republic of Moldova 25/12/1991 MD (German French Russian English-German French Russian, English)
ME Montenegro 03/06/2006 IB (all-all)
MG Madagascar 24/01/1978 IB (all-all)
MK Former Yugoslav Republic of Macedonia 10/08/1995 EP (English German French-English German French) – MK (English-English)
ML Mali 19/10/1984 OA (English French-English French)
MN Mongolia 27/05/1991 MN (English Russian-?)
MR Mauritania 13/04/1983 OA (English French-English French)
MT Malta 01/03/2007 EP (English German French-English German French) – MT (English-English)
MW Malawi 24/01/1978 AP (English-?) – MW (English-English)
MX Mexico 01/01/1995 MX (Spanish-Spanish)
MY Malaysia 16/08/2006 MY (English-English)
MZ Mozambique 18/05/2000 AP (English-?)
NA Namibia 01/01/2004 AP (English-?)
NE Niger 21/03/1993 OA (English French-English French)
NG Nigeria 08/05/2005 IB (all-all)
NI Nicaragua 06/03/2003 NI (Spanish-Spanish)
NL Netherlands 10/07/1979 EP (English German French-English German French) – NL (English German French Dutch-English German French)
NO Norway 01/01/1980 EP (English German French-English German French) – NO (English Norwegian-English)
NZ New Zealand 01/12/1992 NZ (English-English)
OM Oman 26/10/2001 IB (all-all)
PA Panama 07/09/2012 PA (Spanish-Spanish)
PE Peru 06/06/2009 PE (Spanish-Spanish)
PG Papua New Guinea 14/06/2003 PG (English-English)
PH Philippines 17/08/2001 PH (English Filipino-?)
PL Poland 25/12/1990 EP (English German French-English German French) – PL (English German French-?)
PT Portugal 24/11/1992 EP (English German French-English German French) – PT (English German French Portuguese-English German French Portuguese)
QA Qatar 03/08/2011 ?
RO Romania 23/07/1979 EP (English German French-English German French) – RO (English German French Romanian Russian-?)
RS Serbia 01/02/1997 EP (English German French-English German French) – RS (English-English)
RU Russian Federation

/td>

29/03/1978 EA (English Russian-English Russian)
RW Rwanda 31/08/2011 AP (English-?) – RW(?-?)
SA Saudi Arabia 03/08/2013 SA (English Arabic-English Arabic)
SC Seychelles 07/11/2002 SC (English-English)
SD Sudan 16/04/1984 AP (English-?) – SD (English-?)
SE Sweden 17/05/1978 EP (English German French-English German French) – SE (English Danish Finnish Norwegian Swedish-English)
SG Singapore 23/02/1995 SG (English-English)
SI Slovenia 01/03/1994 EP (English German French-English German French) – SI (English German French Slovenian-English German French)
SK Slovakia 01/01/1993 EP (English German French-English German French) – SK (English German French Slovak-English German French)
SL Sierra Leone 17/06/1997 AP (English-?)
SM San Marino 14/12/2004 EP (English German French-English German French) – SM (English French Spanish Italian-English)
SN Senegal 24/01/1978 OA (English French-English French)
ST Sao Tome and Principe 03/07/2008 IB (all-all)
SV El Salvador 17/08/2006 SV (Spanish-?)
SY Syrian Arab Republic 26/06/2003 SY (English Arabic French-English Arabic French)
SZ Eswatini 20/09/1994 AP (English-?)
TD Chad 24/01/1978 OA (English French-English French)
TG Togo 24/01/1978 OA (English French-English French)
TH Thailand 24/12/2009 TH (English Thai-English)
TJ Tajikistan 25/12/1991 EA (English Russian-English Russian) – TJ (English Russian-?)
TM Turkmenistan 25/12/1991 EA (English Russian-English Russian) – TM (English Russian-?)
TN Tunisia 10/12/2001 TN (Arabic English French-?)
TR Turkey 01/01/1996 EP (English German French-English German French) – TR (English German French Turkish-English German French)
TT Trinidad and Tobago 10/03/1994 TT (English-English)
TZ United Republic of Tanzania 14/09/1999 AP
UA Ukraine 25/12/1991 UA (English Russian-English Russian)
UG Uganda 09/02/1995 AP (English-?)
US United States of America 24/01/1978 US (English-English)
UZ Uzbekistan 25/12/1991 UZ (English Russian-Russian)
VC Saint Vincent and the Grenadines 06/08/2002 IB (all-all)
VN Vietnam 10/03/1993 VN (English Russian-English Russian)
ZA South Africa 16/03/1999 ZA (English-English)
ZM Zambia 15/11/2001 AP (English-?) – ZM (English-English)
ZW Zimbabwe 11/06/1997 AP (English-?) – ZW (English-?)

Note: There are additional ROs in addition to the national ROs listed below.

  • AP: African Regional Intellectual Property Organization,
  • EP: European Patent Office, EA: Eurasian Patent Organization, OA: African Intellectual Property Organization,
  • XN: Nordic Patent Institute.