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| Patents Granted on 1821-03-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,310X | Mar. 20, 1821 | J. Aborn | Machine for dipping candles | candle making machinery | |
| 3,311X | Mar. 20, 1821 | P. Laporte | Bridle for stopping horses when running away | bridles | |
| 3,312X | Mar. 20, 1821 | A. Cock | Machine for planting indian corn | ||
| 3,313X | Mar. 20, 1821 | R. Hunt, II | Hooping or tiring carriage wheels | wheelwright | |