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UK trademark search engine
http://www.ipo.gov.uk/tmtext
US trademark search engine
http://tmsearch.uspto.gov/
Canada trademark search engine (change pulldown to "Trade-Mark" if you're searching on the text of the trademark itself)
http://www.ic.gc.ca/app/opic-cipo/trdmrks/srch/tmSrch.do?lang=eng
EU trademark search engine (untick all except "Trade marks" if you only want to search for trademarks)
http://esearch.oami.europa.eu/
http://www.ipo.gov.uk/tmtext
US trademark search engine
http://tmsearch.uspto.gov/
Canada trademark search engine (change pulldown to "Trade-Mark" if you're searching on the text of the trademark itself)
http://www.ic.gc.ca/app/opic-cipo/trdmrks/srch/tmSrch.do?lang=eng
EU trademark search engine (untick all except "Trade marks" if you only want to search for trademarks)
http://esearch.oami.europa.eu/