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| Patents Granted on 1820-07-28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,218X | Jul. 28, 1820 | T. Dakin | Draw grinding gun barrels | gunsmith | |
| 3,219X | Jul. 28, 1820 | J.S. Wright | Plough | plows | |
| 3,220X | Jul. 28, 1820 | M. Fowler (Fowler Mallby) | Machine for hulling grain and rice | miller | |