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| Patents Granted on 1820-05-03 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,200X | May 03, 1820 | J. Butters, E. Howard | Machine for splitting leather | splitting and shearing machinery | |
| FX-3,200 | May 03, 1820 | N. Winslow | Cooking stove | stoves | |
| 3,201X | May 03, 1820 | I.L. Skinner | Machine for excavating canals | ||