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European Patent Office - 30 million patent documents searchable free of charge on the internet. An initiative of the European Patent Organisation.
 
Free PDF Files of U.S. Patents - Retrieve the full text and images of US patents as PDF files.
 
How to Get a Patent - Basic information on the patenting process.
 
United States Patent and Trademark Office - The USPTO provides downloadable forms, free online patent and trademark searching and other information.
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