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| Patents Granted on 1821-12-04 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,411X | Dec. 04, 1821 | J.M. Yard | Machine for making candles | candle making machinery | |
| 3,412X | Dec. 04, 1821 | J.G. Vought | Chemical anti-dysenteric medicine | ||
| 3,413X | Dec. 04, 1821 | G.H. Thompson | Protractors | protractors | |