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| Patents Granted on 1820-12-30 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,275X | Dec. 30, 1820 | P. Moody | Double speeder | spinner | |
| 3,276X | Dec. 30, 1820 | J. Fisher | Machinery for sleighs | ||
| 3,277X | Dec. 30, 1820 | E. Hardy, S. Hardy | Reel for spinning and making tobacco | tobacco machinery | |
| 3,278X | Dec. 30, 1820 | H. Allen | Current and Tide Mill | tide mills | |
| 3,279X | Dec. 30, 1820 | A.N. Sabin | Application of steam | ||