» US Patent and Trademark Office (USPTO) For patent searching, the US Patent and Trademark Office (USPTO) site is good, since it allows full-text Boolean searches.
» Esp@cenet Esp@cenet is very good for researching international patent families.
» Thomson Innovation The Thomson Innovation site is also good and includes US, European and PCT files.
» Google Patent Google Patent can provide a rewarding alternative search.
» Prosecution histories of US patents Prosecution histories of US patents and patent filings can be found here.
» Dialog The Dialog pay as you go site is recommended for trade mark searches and for non-US patent searching.
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