http://www.ipo.gov.uk/search
http://patft.uspto.gov
http://www.espacenet.com/index.en.htm
http://brevets/patents.ic.gc.ca/opic/cipo/cpd/eng/introduction.html>
https://patentscope.wipo.int/search/en/search.jsf
http://www.wipo.int/branddb/en
http://www.wipo.int/romarin/search.xhtml;jsessionid=28FDA3B344066F27C483EE4492E94D5E
http://www.wipo.int/designdb/en/index.jsp
http://www.wipo.int/designdb/hague/en
http://www.wipo.int/ipdl/en/search/lisbon/search/struct.jsp
http://www.wipo.int/ipdl/en/6ter/search/struct.jsp
Linguistic Search http://www.wipo.int/wipopearl/search/linguisticSearch.html
Concept Map Search http://www.wipo.int/wipopearl/search/conceptMapSearch.html