International
    Search the World Intellectual Property Organization's Patent Cooperation Treaty (PCT) Patent Database
 
United States
    General Searches
       Search the US Patent and Trademark Office Database
        

   Specialized Searches
       Search the US DNA Patent Database
       Search the Software Patent Institute Database of Software Technologies

   Search Service Providers
       Optipat/MicroPatent Patent Search Services
       Community of Science US Patent Search Service

Canada
    Search the Canadian Patent Database via the CIPO
 
Europe
    Search European Patent Databses via espacenet

United Kingdom
    Search for UK Patents through espacenet
 
Japan
    Search Japanese patents via the IBM patent server

Australia
    Search the Australian Patent Database via IP Australia

New Zealand
    Search New Zealand Patents via IPONZ