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Google PatentsSearch and read the full text of patents from around the world with Google Patents, and find prior art in our index of non-patent literature.
WIPO - Search International and National Patent CollectionsThis patent search tool allows you not only to search the PCT database of about 2 million International Applications but also the worldwide patent collections. This search facility features: flexible search syntax; automatic word stemming and relevance ranking; as well as graphical results.
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