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| Patents Granted on 1821-12-31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,429X | Dec. 31, 1821 | A. Dana | Water proof boots and shoes | ||
| 3,430X | Dec. 31, 1821 | H. Warral | Cupola furnace | industrial furnaces | |
| 3,431X | Dec. 31, 1821 | W.J. Cantello | Corsetts | ||
| 3,432X | Dec. 31, 1821 | W. Dean | Machinery of clocks | clockmaker | |