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U.S.:

• U.S. Patent Office Full Text Database -Free
  

• Delphion Intellectual Property Network
  
• Get The Patent.com
• IP-Discover - free for students and non-profits
  
• SurfIP.com - search many databases at once
  
• IPOrganizer.com
  
• IP Search Engine - patents and non-patent prior art
  
• CASWEB - Chemical Patents Plus!
  
• CNIDR U.S. Patent Database - Free (abstracts back to 1975)
  
• MicroPatent
  
• Lexis-Nexis
  
• Shadow Patent Office
  
• Software Patent Institute
  
• COS US Patent Database -Free
  
• DNA Patent Database
  
• U.S. Dept. of Agriculture Biotech Patents
  
• Questel Orbit Patent Database
  
• Derwent
  
• IFI Claims Databases
  
• Chi Research
  
• Fullerene Patent Database
  
• Dialog

International:

• WIPO Patent Database -Free
  

• Esp@ceNet (EPO) -Free
  
• PCT Gazette Search -Free
• GetPat & GetPat Pro
  
• PCT Registrations
  
• German Patents
  
• Japanese Patent Info