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| Patents Granted on 1820-09-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,231X | Sep. 07, 1820 | E. Wadsworth | Weighing machines | ||
| 3,232X | Sep. 13, 1820 | J. Henry | Construction of clocks | clockmaker | |
| 3,233X | Sep. 13, 1820 | J. Henry | Mode of finding the longitude | surveyor | |
| 3,234X | Sep. 20, 1820 | R.L. Stevens | Plough | plows | |
| 3,235X | Sep. 20, 1820 | J. Balthorpe (Balltlirope) | Double Shovel Plough | plows | |