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| Patents Granted on 1812-08-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,790X | Aug. 21, 1812 | A. Anderson | Propelling boats and vessels, etc. | nautical propulsion apparatus | |
| 1,791X | Aug. 21, 1812 | A. Anderson | Steam engine | steam engines | |
| 1,792X | Aug. 21, 1812 | J. Truman | Steam washer | washing machines | |
| 1,793X | Aug. 21, 1812 | J. Palmer | Washing machine | washing machines | |
| 1,794X | Aug. 21, 1812 | R. Maiben | Apparatus for making oil of vitriol | ||