美国专利局 A powerful, flexible web-based patent search application that improves the overall patent searching process. It includes two user selected interfaces that provide enhanced access to prior art.
SimilarSites Discover the best websites and explore competitor and related sites with Similarsites.com, the extension that enables you to browse associated content.
WIPO专利查询 A world-wide collection of designs data; including WIPO Hague registrations and information from participating offices.