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Use these sites to perform a keyword search of published patents. e.g. piezoelectric, transistor, gasket, mesothelioma, etc

US patent 6,907,404 is entered as us6907404
US patent publication 2004/0215708 is entered as us2004/0215708
US patent application 10/447,493 is entered as us10/447493
European application EP 1 661 800 is entered as ep1661800
WIPO publication WO 2004/057274 is entered as wo2004057274