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A thorough patent search doesn't stop with U.S. patents. You need to search worldwide patent databases as well, such as PatentScope. You should also consider searching European and Asian patents using the links in the boxes below.
The PATENTSCOPE database (hosted by the World Intellectual Property Organization) provides access to international Patent Cooperation Treaty (PCT) applications in full text format on the day of publication, as well as to patent documents of participating national and regional patent offices.