| Technical | Site | Search | |
| URL | information | quality | quality |
| http://www.patent.gov.uk | **** | **** | NA |
| http://dips.patent.gov.uk | NA | *** | *** |
| http://eps.dips.org | NA | *** | *** |
| http://www.european-patent-office.org | **** | * | NA |
| http://www.uspto.gov | **** | ** | ** |
| http://www.inpi.fr | **** | * | Inaccessible |
| http://patent.womplex.ibm.com/boolquery.html | NA | ** | ***** |
| http://www.patentminer.com | * | *** | ** |
| **** | **** | NA | |
| NA | *** | *** | |
| NA | *** | *** | |
| **** | * | NA | |
| **** | ** | ** | |
| **** | * | Inaccessible | |
| NA | ** | ***** | |
| * | *** | ** |
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