The following 146 countries are members of the International Patent Convention and are designated in an International (PCT) patent application:
Albania, Algeria, Angola, Antigua and Barbuda, Armenia (EA), Australia, Austria (EP), Azerbaijan (EA)
Bahrain, Barbados, Belarus (EA), Belgium (EP)(2), Belize, Benin (OA)(2), Bosnia and Herzegovina (1), Botswana (AP), Brazil, Brunei Darussalam (from 24 July 2012), Bulgaria (EP), Burkina Faso (OA)((2)
Cameroon (OA)(2), Canada, Central African Republic (OA)(2), Chad (OA)(2), Chile, China, Colombia, Comoros, Congo (OA)(2), Costa Rica, Cote d'Ivoire (OA)(2), Croatia (EP), Cuba, Cyprus (EP)(2), Czech Republic (EP)
Democratic People's Republic of Korea, Denmark (EP), Dominica, Dominican Republic
Ecuador, Egypt, El Salvador, Equatorial Guinea (OA)(2), Estonia (EP)
Finland (EP), France (EP)(2)
Gabon (OA)(2), Gambia (AP), Georgia, Germany (EP), Ghana (AP), Greece (EP)(2), Grenada, Guatemala, Guinea (OA)(2), Guinea-Bissau (OA)(2)
Honduras, Hungary
Iceland (EP), India, Indonesia, Ireland (EP)(2), Israel, Italy (EP)(2)
Japan
Kazakhstan (EA), Kenya (AP), Kyrgyzstan (EA)
Lao People's Democratic Republic, Latvia (EP)(2), Lesotho (AP), Liberia (AP), Libyan Arab Jamahiriya, Liechtenstein (EP), Lithuania (EP), Luxembourg (EP)
Madagascar, Malawi (AP), Malaysia, Mali (OA)(2), Malta (EP)(2), Mauritania (OA)(2), Mexico, Monaco (EP)(2), Mongolia, Montenegro, Morocco, Mozambique (AP)
Namibia (AP), Netherlands (EP)(2), New Zealand, Nicaragua, Niger (OA)(2), Nigeria, Norway
Oman
Panama (from 7 September 2012), Papua New Guinea, Peru, Philippines, Poland (EP), Portugal (EP)
Qatar
Republic of Korea, Republic of Moldova (EA), Romania (EP), Russian Federation (EA), Rwanda (AP)
Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, San Marino (EP), Sao Tome and Principe, Senegal (OA)(2), Serbia (1), Seychelles, Sierra Leone (AP), Singapore, Slovakia (EP), Slovenia (EP)(2), South Africa, Spain (EP), Sri Lanka, Sudan (AP), Swaziland (AP)(2), Sweden (EP), Switzerland (EP), Syrian Arab Republic
Tajikistan (EA), Thailand, The former Yugoslav Republic of Macedonia (EP), Togo (OA)(2), Trinidad and Tobago, Tunisia, Turkey (EP), Turkmenistan (EA)
Uganda (AP), Ukraine, United Arab Emirates, United Kingdom (EP), United Republic of Tanzania (AP), United States of America, Uzbekistan
Viet Nam
Zambia (AP), Zimbabwe (AP)
(1) Extension of European patent possible
(2) May only be designated as a regional patent
AP - ARIPO patent
EA - Eurasian patent
EP - European patent
OA - OAPI patent
Brunei Darussalam will become a PCT contracting state from 24 July 2012 and Panama will become a contracting state from 7 September 2012.