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| Patents Granted on 1831-04-01 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,440X | Apr. 01, 1831 | J. Tousey (Tonsey), G. Cande | Thrashing machine | threshers and thrashers | |
| 6,441X | Apr. 01, 1831 | H. Knowles | Improved mode of manufacturing wood-screws | screw machines | |
| 6,442X | Apr. 01, 1831 | J. Powell | Washing gold ores and alluvial auriferous earth | ||