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| Patents Granted on 1820-06-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,206X | Jun. 02, 1820 | E.S. Curtis | Improvement on the white wash brush | ||
| 3,207X | Jun. 05, 1820 | J. Hatch | Machine for making watch chains | chain making machines | |
| 3,208X | Jun. 15, 1820 | A. Woolworth | Machine for turning gunstocks | gunsmith | |
| 3,209X | Jun. 17, 1820 | L.S. Parmly | Composition for cleansing and preserving teeth | ||
| 3,210X | Jun. 17, 1820 | D. Coit | Improvement on his Family pills | ||
| 3,211X | Jun. 24, 1820 | A. Bailey | Floating wharfs for catching fish | ||