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External Databases

Country/Organization URL
Australia http://pericles.ipaustralia.gov.au/ols/auspat/
Canada  http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/introduction.html
Chile http://ion.inapi.cl:8080/Patente/ConsultaAvanzadaPatentes.aspx
China http://www.pss-system.gov.cn/sipopublicsearch/ensearch/searchEnHomeIndexAC.do
Czech Republic http://www.upv.cz/en/client-services/online-databases/patent-and-utility-model-databases.html  
European Patent Office http://www.espacenet.com
Eurasian Patent Organization (EAPO) http://www.eapatis.com/ensearch/
Finland http://patent.prh.fi/patinfo/default2.asp
France http://bases-brevets.inpi.fr/en
Germany https://depatisnet.dpma.de/DepatisNet/
Hungary http://www.hipo.gov.hu/kereso/
India http://ipindiaservices.gov.in/patentsearch/search/index.aspx
Ireland http://www.patentsoffice.ie/en/patents_searching.aspx
Japan  https://www.j-platpat.inpit.go.jp/
Latin America http://lp.espacenet.com/
New Zealand  http://www.iponz.govt.nz/app/Extra/IP/PT/Qbe.aspx?sid=635310401987053816
Norway https://search.patentstyret.no/
OHIM (Office for Harmonization in the Internal Market) https://oami.europa.eu/ohimportal/en/databases
Republic of Korea http://www.kipris.or.kr/khome/main.jsp
(Korean Traditional Knowledge Portal)
Romania http://bd.osim.ro/cgi-bin/invsearch8
Russian Federation http://new.fips.ru/en/informational-resources/information-retrieval-system/
Singapore https://www.ip2.sg/RPS/WP/CM/SearchSimpleP.aspx?SearchCategory=PT
Slovakia http://www.upv.sk/?databases-and-registers 
Slovenia http://www2.uil-sipo.si/dse.htm
Spain  http://invenes.oepm.es
Switzerland https://www.swissreg.ch/
Thailand http://203.209.117.243/DIP2013/simplesearch.php
United Kingdom  http://www.ipo.gov.uk/types/patent/p-os/p-find.htm
United States of America  http://www.uspto.gov/patft/index.html
http://tess2.uspto.gov/bin/gate.exe?f=login&p_lang=english&p_d=trmk