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Patent Databases

Espacenet - European Patent Office

Search titles of over 50 million patents from 71 countries. Full text PDF of US utility patents 1836-Present. Also seEspacenet Classification Search and Espacenet Online Tutorials
WIPO (world intellectual property organisation). The PATENTSCOPE database 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.
US Patent Search
USPTO Inventor Assistance Center