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| Patents Granted on 1831-04-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,501X | Apr. 21, 1831 | J.G. Conser | Washing machine | washing machines | |
| 6,502X | Apr. 21, 1831 | I. Dawes | Tanning leather | ||
| 6,503X | Apr. 21, 1831 | T. Kearsing, H.O. Kearsing, G.T. Kearsing, W.F. Kearsing | Piano forte | music instrument maker | |
| 6,504X | Apr. 21, 1831 | R. McCormick, Jr. | Art of teaching violin | ||
| 6,505X | Apr. 21, 1831 | D. Smith | Churn | churns | |
| 6,506X | Apr. 21, 1831 | J. Taylor, J. Woodhead | Power loom | looms | |