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| Patents Granted on 1831-04-27 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,521X | Apr. 27, 1831 | J.R. Farling, R.G. Nellis | Saw trimmer | saw sharpening machines | |
| 6,522X | Apr. 27, 1831 | J. Judge | Timbers, Hewing, Dubbing, and Dressing for Ships | boats and ships | |
| 6,523X | Apr. 27, 1831 | A.L. Smith | Thrashing machine shelling corn | threshers and thrashers | |