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| Patents Granted on 1831-04-19 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,492X | Apr. 19, 1831 | S.D. Ingham | Canal navigation by boats | canals | |
| 6,493X | Apr. 19, 1831 | B. Titus | Pipes or tubes | pipes | |
| 6,494X | Apr. 19, 1831 | W.J. Wood | Thrashing machine | threshers and thrashers | |
| 6,495X | Apr. 19, 1831 | W. Woodworth | Machine for cleaning fur | ||