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| Patents Granted on 1823-03-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,671X | Mar. 12, 1823 | H. Aiken | Knife for splitting leather | leatherworker | |
| 3,672X | Mar. 12, 1823 | H. Aiken | Coach and chaise hames | ||
| 3,673X | Mar. 12, 1823 | E.S. Townsend | Towing boats | nautical propulsion apparatus | |