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| Patents Granted on 1831-07-30 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,675X | Jul. 30, 1831 | B. Maltby | Thrashing machine | threshers and thrashers | |
| 6,676X | Jul. 30, 1831 | J. Mewhinney | Churn | churns | |
| 6,677X | Jul. 30, 1831 | I. Genung | Leather punching for straps | leatherworker | |
| 6,678X | Jul. 30, 1831 | W. Greathouse | Machine for breaking hemp | flax and hemp machines | |
| 6,679X | Jul. 30, 1831 | O. Tufts | Hand printing press | printer | |