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| Patents Granted on 1831-04-11 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,467X | Apr. 11, 1831 | A. Parkhurst | Machine for mixing clay | ||
| 6,468X | Apr. 11, 1831 | S. Bacon, A. Parkhurst | Propelling power for mills | ||
| 6,469X | Apr. 11, 1831 | G.H. Richards | Caoutchouc, fluid to render articles water proof | ||
| 6,470X | Apr. 11, 1831 | J. White | Washing and churning machine | washing machines | |