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| Patents Granted on 1820-12-07 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,264X | Dec. 07, 1820 | J. Fisk (Fiske) | Combination of improvements on the double speeder | spinner | |
| 3,265X | Dec. 07, 1820 | J. Fisk (Fiske) | Improvement on no. 1 double speeder | spinner | |
| 3,266X | Dec. 07, 1820 | J. Fisk (Fiske) | Improvement on no. 2 double speeder | spinner | |