What is your favorite patent search engine?

• PatentBrain: US and WO Algorithmic Patent Search

• DEPATISnet: Worldwide patent search

• Esp@cenet

• Patmedia - Visual patent search

• ArnoldIT.com: US patents

• Boliven Patents: US, WO, EP, JP; KR patent search

• ChemYQ:Chinese patents

• Clusterpat: patents from US, EP Offices

• DeepDyve: US patents

• Espresso: US patents

• Patentdocs: US patents

• Freepatentsonline: US, EP, JP, PCT patents

• FreshPatents.com: US patents

• Get the Patent: US, EP, WO search

• Google US patents

• IPEXL: CN, TW, HK, SG, JP, KR, PCT, US, EP, UK, CA

• IP Newsflash EP Search

• ipXnase Cross-lingual patent search

• Uppdragshuset: Nordic (DK, FI, NO, SE) Patents

• OTI.com worldwide patent search

• ParkerIP: Search in USPTO and Esp@cenet Database

• PatentAnalysis: INPADOC, US, EP, WO, AU, NZ patent search

• Patent Cat Patent Family Search

• PatentCluster: US patents

• Deutsches Patentrecherche

• SIP worldwide patent search

• Patent Genius

• Patentics: US, EP, JP, WO, CN collections

• PatentLens:US, EP, PCT, AU Patent Search

• Patents.com: US, EP patents

• PatentStorm: US patents

• PIE Patent Information Everywhere: KR, US, EP, JP, PCT search

• Power-info: Search in USPTO, Esp@cenet databases

• PRIORsmART: Patent Search Portal

• IPVision: US patents

• SooPAT Patent Search: Worldwide patent search in Chinese

• SumoBrain: JP, PCT, US, EP patent search

• SurfIP: Search US, PCT, EP, SG, CN, CA, KR, UK, TH, JP

• ToolPat: Quick US,WO, EP search

• WikiPatents: US, CA, GB, DE, JP patent search

• PATENTSCOPE: WIPO PCT search

• Xyggy Patent: Find similar US patents

• Other: