| Australian patent data - AusPat |
| Canadian Patents Database |
| esp@cenet : European Patent Office |
| Google Patents |
| Japan's Patent Database |
| Korea Patents |
| Lens.Org : Search, Analyze and Manage Patent and Scholarly Data |
| Patent Field |
| Patentscope |
| The FreePatentsOnline |
| The United States Patent and Trademark Office (USPTO) |
| Türk Patent Veri Tabanı |
