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| Patents Granted on 1831-04-22 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,507X | Apr. 22, 1831 | E.R. Currier | Horizontal piano forte | music instrument maker | |
| 6,508X | Apr. 22, 1831 | J. Deitz | Horse shoes | farrier | |
| 6,509X | Apr. 22, 1831 | W. Foster | Stump machine | stump elevators | |
| 6,510X | Apr. 22, 1831 | D. Harrington | Ink holder | household tools | |
| 6,511X | Apr. 22, 1831 | A. Richison | Thrashing machine | threshers and thrashers | |