I patents sono sempre una risorsa difficile da stanare. Un buon punto di accesso da cui partire può essere http://www.freepatentsonline.com/
FreePatentsOnline.com provides fast, free access to all US patents and patent applications, partial European data, free PDF downloading, free account features, and more. With the most powerful patent search engine on the web, and an ever-expanding data collection, FreePatentsOnline is rapidly becoming the premiere way to search patents
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