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| Patents Granted on 1820-08-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,223X | Aug. 12, 1820 | L. Thwing | Machinery for passing boats up rapids | nautical propulsion apparatus | |
| 3,224X | Aug. 12, 1820 | J. Chittenden | Locks and latches, etc. | household tools | |
| 3,225X | Aug. 12, 1820 | N. Haight, J. Haight | Making ingrained carpeting | ||