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| Patents Granted on 1806-04-__ | |||||
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| Number | Date | Patentee | Title | Type | |
| 681X | Apr. 01, 1806 | R. Tripe | Diving machines | ||
| 682X | Apr. 05, 1806 | I. Quintard | Cider and bark mills | bark processing machines | |
| 683X | Apr. 17, 1806 | J. Heavin | Propelling boats up rivers by cranks and setting poles | nautical propulsion apparatus | |
| 684X | Apr. 17, 1806 | J. Heavin | Machine for cutting straw | hay or straw cutters | |
| 685X | Apr. 25, 1806 | J. Quinby | Saw mills | sawmills | |