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| Patents Granted on 1831-08-06 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,688X | Aug. 06, 1831 | N. Hockett | Washing with or without steam | washing machines | |
| 6,689X | Aug. 06, 1831 | T. Oxnard | Sirup, apparatus for filtering and washing animal black, used in clarifying sugar | sugar refining apparatus | |
| 6,690X | Aug. 06, 1831 | J. Thompson | Piano forte action | music instrument maker | |