| free patents online patent database | 1.96 | 0.3 | 5861 | 35 | 8 |
| free patent search database | 0.77 | 0.2 | 1786 | 27 | 85 |
| uspto online patent database | 1.48 | 0.7 | 7268 | 28 | 48 |
| free patents online patent search | 1.81 | 0.1 | 8230 | 33 | 67 |
| us patent download database | 1.68 | 0.1 | 5821 | 27 | 82 |
| free patent copies database | 0.33 | 0.4 | 1797 | 27 | 62 |
| free online patents information | 0.51 | 0.2 | 523 | 31 | 85 |
| google patent is a free patent database | 1.88 | 0.7 | 7967 | 39 | 78 |
| free online patents search website | 0.47 | 0.7 | 1852 | 34 | 13 |
| us patent office patent search database | 1.8 | 1 | 7593 | 39 | 43 |
| united states patent database | 1.91 | 1 | 5152 | 29 | 46 |
| free online patents search portal | 0.06 | 0.3 | 2885 | 33 | 45 |
| free invention patent database | 1.01 | 0.9 | 3081 | 30 | 39 |
| u s patents database | 0.45 | 0.5 | 3872 | 20 | 71 |
| patent database search software | 0.07 | 0.9 | 2289 | 31 | 75 |
| us patent database search | 0.13 | 0.5 | 6013 | 25 | 42 |
| patent information and databases | 0.53 | 0.2 | 9751 | 32 | 3 |
