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| Patents Granted on 1831-12-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,867X | Dec. 21, 1831 | O.A. Fuller | machine for letting in boxes for wagons | wagon maker | |
| 6,868X | Dec. 21, 1831 | I. Jennings | Steam engine boiler | stationary boilers | |
| 6,869X | Dec. 21, 1831 | J.L. Mathies | Perpetual rotary oven | ||
| 6,870X | Dec. 21, 1831 | J.W. Messenger | Cross cut sawing machine | other wood sawing machines | |
| 6,871X | Dec. 21, 1831 | O. Willis | Gold, washing machine, called the railway car gold riddle | ore processing apparatus | |