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Espacenet - European Patent Office

Search titles of over 50 million patents from 71 countries. Full text PDF of US utility patents 1836-Present. Also see Espacenet Classification Search and Espacenet Online Tutorials

Patentscope

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

https://www.uspto.gov/patents-application-process/search-patents

USPTO Inventor Assistance Center

https://www.uspto.gov/patents-application-process/search-patents

Google Patent Search 

https://patents.google.com/

Google Advanced Patent Search 

https://www.google.com/advanced_patent_search


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