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| Patents Granted on 1831-04-16 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,482X | Apr. 16, 1831 | J. Beckwith | Pump or engine for raising water and ejecting air | rotary pumps | |
| 6,483X | Apr. 16, 1831 | I. Lockman, R.P. Jaralemon | Moving vessels on rollers | ||
| 6,484X | Apr. 16, 1831 | S. Kilburn | Machinery, apparatus for communicating motion | ||
| 6,485X | Apr. 16, 1831 | J. Partridge | Tray-making machine | specialty woodworking machines | |
| 6,486X | Apr. 16, 1831 | O.H. Shaw | Art of teaching arithmetic | ||