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| Patents Granted on 1831-04-06 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,448X | Apr. 06, 1831 | J. Ames | Machine for washing rags | washing machines | |
| 6,449X | Apr. 06, 1831 | S. Boyden | Manufacturing malleable cast iron | trade specific | |
| 6,450X | Apr. 06, 1831 | S. Lane | Thrashing machine | threshers and thrashers | |
| 6,451X | Apr. 06, 1831 | R. Tenney, E. Mudge | Scoop shovel | shovels | |
| 6,452X | Apr. 06, 1831 | J. Scott | Glass frame for pictures | ||
| 6,453X | Apr. 06, 1831 | W.A. Turner | Preventing explosion of boilers and burning | stationary boilers | |