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| Patents Granted on 1831-05-09 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,547X | May 09, 1831 | S. Fahrney | Thrashing machine | threshers and thrashers | |
| 6,548X | May 09, 1831 | D. Strobel, Jr. | Blowing wind for furnaces | ||
| 6,549X | May 09, 1831 | D. Strobel, Jr. | Sirup or cane juice, concentrated by steam | ||