Website for Patent Search File

# Search Engine/Database URL
Government Organizations (Freely Available)
1 USPTO (United States Patent and Trademark Office)
2 EspaceNet (EPO; European Patent Office)
3 Japan Patents (IPDL; Industrial Property Digital Library)
4 Indian Patent Information Retrieval System (Indian Patent and Design Office)
5 PatentScope (WIPO; World Intellectual Property Organization)
Open Access
6 Patent Lens
7 Google Patent Database
8 Free Patents Online
9 Intellectual Property Library
10 Fresh Patents