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| Patents Granted on 1820-02-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,172X | Feb. 01, 1820 | C. White | Water proof cement | ||
| 3,173X | Feb. 17, 1820 | J. Kelly, A. Buffum | Elastic water proof hats | ||
| 3,174X | Feb. 17, 1820 | J. Williams | Makring spruce beer | ||
| 3,175X | Feb. 23, 1820 | P.H. Martin | Elastic seat saddles | ||
| 3,176X | Feb. 23, 1820 | I. Keyes | Cooking stove | stoves | |