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| Patents Granted on 1831-04-05 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,444X | Apr. 05, 1831 | M.D. Mulford | Washing machine | washing machines | |
| 6,445X | Apr. 05, 1831 | R. Wilcox | Metallurgical operations by chemical agents | trade specific | |
| 6,446X | Apr. 05, 1831 | R. Wilcox | Metallurgical operations by anthracite coal | trade specific | |
| 6,447X | Apr. 05, 1831 | R. Wilcox | Metallurgical operatons by bituminous coal, charcoal | trade specific | |