| Title | Summary | |
| Chinese Patent Database (fulltext)(Free) | SummaryPage |
| Download a US patent in one PDF file(Free) | SummaryPage |
| esp@cenet, the GB site | SummaryPage |
| Patent Lens: Free FullText Life Sciences Patent Database(Free) | SummaryPage |
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| Derwent Innovations Index, Chinese National Science Digital Library web gate | SummaryPage |
| esp@cenet: Europe's Network of Patent Databases(Free) | SummaryPage |
| Japanese Patent & Utility Model Gazette DB (in English)(Free) | SummaryPage |
| Japanese Patent & Utility Model Gazette DB (in Japanese)(Free) | SummaryPage |
| USPTO Web Patent Database(Free) | SummaryPage |
|
| Chinese Patent Database (fulltext), from China Patent Information Center(Free) | SummaryPage |
| Google Patent Search | SummaryPage |
| SureChem Free(Partly Free) | SummaryPage |
|
| CIPO's Canadian Patent Database(Free) | SummaryPage |
| Delphion from the IBM Intellectual Property Network (IPN)(Partly Free) | SummaryPage |
| Expired Patents Database of China (fulltext)(Free) | SummaryPage |
| Free search of registered Korean patents 1979-98(Free) | SummaryPage |
| German Patents in fulltext (PDF)(Free) | SummaryPage |
| Information Holdings Inc.(IHI) | SummaryPage |
| IP.com disclosures database(Free) | SummaryPage |
| Need advice on best systems for structure/patent searches | SummaryPage |
| Patent Document Delivery | SummaryPage |
| Patent Information Knowledge Base /FAQ of PIUG | SummaryPage |
| Polish Patent Office | SummaryPage |
| Research Disclosure | SummaryPage |
| Search the patents databases of IP Australia(Free) | SummaryPage |
| Searching multiple patent sources(Partly Free) | SummaryPage |
| To find old patents | SummaryPage |
| To locate German patents | SummaryPage |
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